Linterna Mágica

This manual (updated 20 February 2014) is for Linterna Mágica (version 1.20), a userscript for watching web video clips inside a browser without the proprietary flash technology.

Watch video on the web in a brand new way: “You don’t need a glint, the magic lantern is ignited!”

Copyright © 2010, 2011, 2012 Ivaylo Valkov <[email protected]>
Copyright © 2013, 2014 Ivaylo Valkov <[email protected]>
Copyright © 2010 Anton Katsarov <[email protected]>

Permission is granted to copy, distribute and/or modify this document under the terms of either

• the GNU General Public License as published by the Free Software Foundation; either version 3 of the License, or (at your option) any later version, or
• the GNU Free Documentation License, Version 1.3 or any later version published by the Free Software Foundation; with no Invariant Sections, no Front-Cover Texts, and no Back-Cover Texts.

Copies of the licenses are included in the sections entitled “GNU General Public License” and “GNU Free Documentation License” respectively.

1. Introduction to Linterna Mágica

1.1 What is Linterna Mágica?

Linterna Mágica is “tiny” (at least it started that way) script written in JavaScript for the Greasemonkey extension. It searches web pages for flash objects with links to video clips and replaces them with <object> tag that is playable by browser video plugin. The program is named after an early version of a projection apparatus.

1.2 Why it exists?

The short answer: I had spare time and was curious is it going to work.

The long answer: Free software flash plugins like Gnash and Swfdec do not work well with video flash players on every site. On top of that:

• Even with free software plugin you run a lot of proprietary software as ActionScript
• Even the free software plugins use too much resources
• Flash is proprietary technology
• Flash is not a web standard
• Most of the flash objects in a page contain useless stuff

Playback of video clips in a browser is technically possible since the existence of the <object> tag (around 1999; maybe even before that?!). To watch a video inside a browser the user always needs a plugin (HTML5 changes that a bit). Why it should be flash plugin?

Most of the time I do not have Gnash or Swfdec installed. I do not care about flash except, sometimes for video clips. I got tired of using Bash/Perl/Python… scripts to download video clips and watch them. Linterna Mágica was born.

1.3 Who made it?

Original idea and programming by Ivaylo Valkov.
Interface design by Anton Katsarov.

1.4 How to pronounce Linterna Mágica?

The name Linterna Mágica is in Spanish. The pronunciation in IPA is /lintˈɛrna maxˈika/. You can also find the answer to that question by playing the Ogg Vorbis file ‘linterna mágica - pronounce.ogg’ located in the ‘data’ directory.

2. Installation and building

2.1 Building the userscript

Since version 0.0.9 of Linterna Mágica the userscript have to be build, if you have downloaded the source code tarball. If you do not want to build the script, visit Linterna Mágica’s web site and download the compiled version of the script, which is ready for installation. To build the userscript you will need the following packages:

‘GNU make’

‘GNU sed’

‘GNU grep’

‘GNU bash’

‘GNU Coreutils’

ls, cp, rm, cat, tac, head, tail, cut, tr, sort, uniq, base64, basename, mktemp, test, echo, chmod

To build the userscript, inside a terminal change the directory to the source code directory of Linterna Mágica and type:
‘make’
If everything went fine, at the end of the building process you should see the following message:

  linternamagica.user.js is ready.

To remove all the generated files without the userscript, type:
‘make clean’
To remove all the generated files and the userscript file, type:
‘make distclean’

2.2 Installation

First of all install the userscript extension for your browser and activate it. For Epiphany it is part of the Epiphany-extensions package. For GNU IceCat, Abrowser and other versions of Firefox see the Greasemonkey and/or the Scriptish web pages. For Chromium see the Tampermonkey website.

Probably these extensions are available in your GNU/Linux distribution as a package.

Second, install the video plugin that you prefer.

If you have downloaded version of the userscript compressed with gzip or bzip2, decompress it to get a copy of the file ready for installation.

2.2.1 Installation from browser

Load the path where you downloaded Linterna Mágica in your browser:
‘file:///home/user/linterna-magica/’

You can also start it from a terminal:
‘epiphany file:///home/user/linterna-magica/’
or
‘abrowser file:///home/user/linterna-magica/’
or
‘icecat file:///home/user/linterna-magica/’

‘iceape file:///home/user/linterna-magica/’

Right-click the user script and from the menu select

For Epiphany

“Install userscript”

For GNU IceCat and other free software versions of Firefox

“View User Script Source”. In the new window click the Greasemonkey “Install” button. If you are using Scriptish, choose “Install User Script…”.

For Midori

For Midori version 0.3.0 and above select “Open Link in Bew Tab”. In the new tab click “Install user script” button. Versions before 0.3.0 do not support instala do not support installation of userscripts from the browser.

For Iceape (and other versions of Seamonkey)

“Install User Script…”

2.2.2 Installation from terminal

Another option to install the userscript is to copy it from a terminal. The paths in the examples bellow might be different in your configuration and setup.

For Epiphany:
‘cp linternamagica.user.js \
~/.gnome2/epiphany/extensions/data/greasemonkey/linterna_magica.user.js’

For GNU IceCat:
‘mkdir ~/.gnuzilla/icecat/profile/gm_scripts/linterna_magica/’
‘cp linternamagica.user.js \
~/.gnuzilla/icecat/profile/gm_scripts/linterna_magica/linterna_magica.user.js’

For other free software versions of Firefox:
‘mkdir ~/.mozilla/firefox/profile/gm_scripts/linterna_magica/’
‘cp linternamagica.user.js \
~/.mozilla/firefox/profile/gm_scripts/linterna_magica/linterna_magica.user.js’

For Midori:
‘mkdir ~/.local/share/midori/scripts/’
‘cp linternamagica.user.js \
~/.local/share/midori/scripts/linterna_magica.user.js’

For Iceape (and other versions of Seamonkey):
Iceape works only with Scriptish for which there is no easy way to install scripts from a terminal. The scripts are located in

‘~/.mozila/seamonkey/profile/scriptsh_scripts’

but for every installed script there is a definition needed in the file

‘~/.mozila/seamonkey/profile/scriptsh_scripts/scriptish-config.json’
which does not seem simple enough to be done by hand.

3. Configuration

Linterna Mágica has some configuration options. The only way (for now) to configure it, is to edit the code of the userscript.

3.1 Configuration options

To change the configuration of Linterna Mágica open the userscript file and look for var linterna_magica_options. This is a JavaScript object that keeps configuration options in “option”:”value” format:

 var linterna_magica_options =
 {
    "debug": 0,
    "log_to": "web",
    "web_log_expand": false,
    "updates": "1w",
    "priority": "self",
    "manual_run": "on",
    "skip_manual_run":
     [
       "youtube.com",
       "vimeo.com",
       "dailymotion.com",
     ],
    "autostart": "off",
    "controls": "self",
    "locale": "auto",
    "cookies": "restore",
    "wait_xhr": "off",
    "quality": "low",
    "format": "mp4"
 };

Since version 0.0.10 it is possible to keep your configuration in separate userscript file. This way your preferences will stay intact when new version is installed. The userscript with your configuration must have special structure. If you want this feature, install the file ‘linternamagica_user_condfig.user.js’ from the ‘utilities’ directory. To change the configuration look for var linterna_magica_user_config. The format is the same as for the main userscript file. Have in mind that this file is not going to be updated and you will have to add manually new options implemented in future versions, if you don’t like the default ones. If an option is missing in this file, the default one provided by the main userscript will be used.

Available options are:

‘debug’

This option sets the debug level. The debug information is printed in the console.

‘0’

Do not print anything (default)

‘1..5’

Print debug information

‘log_to’

Where to print the debugging information when debug is not zero.

‘web’

Print messages in the web page (default)

‘console’

Use the debugging console of the browser

‘web_log_expand’

Should the web logger be automatically expanded by default

‘false’

No (default)

‘true’

Yes

‘updates’

Should Linterna Mágica automatically check and notify for updates. See section Automatic check for updates.

‘<time><type>’

Check at interval. (default 1w)

‘<time>’

positive integer

‘<type>’

d/w/m/y

‘d/w/m/y’

d = day, w = week, m = month, y = year

‘off’

‘disabled’

‘no’

‘never’

‘false’

‘0’

Do not check

‘priority’

This options determines if Linterna Mágica should replace HTML5 players. The default value is “self”.

‘self’

Replace HTML5 players

‘html5’

Use HTML5 player if the site provides one. A button next to the player switches to Linterna Mágica.

‘manual_run’

How the processing of the page should be done.

‘on/enable/yes/true/1’

A button is present to manually start Linterna Mágica. (default)

‘off/disable/false/no/0’

Automatically start the processing when the page is loaded

‘skip_manual_run’

List of websites where Linterna Mágica should start automatically. Default list:

[ "youtube.com", "vimeo.com", "dailymotion.com", ],

‘autostart’

Auto start playback. If more than one object is found, only the first one will start playback.

‘on/enabled/true’

Auto start the clip (default)

‘off/disabled/false’

Do not start the clip

‘controls’

Buttons for controlling the video

‘self’

Use controls provided by Linterna Mágica (default)

‘plugin’

Use controls provided by the video plugin.

‘locale’

Interface language

‘auto’

Use the language of the browser interface if translation is available (default)

‘<lc>_<CC>’

Set language to lc_CC, where

‘<lc>’

language code (lowercase)

‘<CC>’

country code (uppercase) Example: en_US, en_UK, bg_BG

‘cookies’

The way cookies are processed. See section Disadvantages of the cookies hack.

‘delete’

Just delete the cookies.

‘restore’

Extract and restore cookies.

‘wait_xhr’

Timeout before background processing (XHR) starts in milliseconds. 1 s = 1000 ms. If you have problems increase the value. See section Timed-out background requests.

‘off/no/disabled/false/0’

Don’t wait (default)

‘<integer>’

Wait for <integer> milliseconds.

‘quality’

Preferred video quality.

‘low/medium/high’

Auto-select a link for low/medium/high from the list of links (default low)

‘<number>’

Start the <number> link from the list. If not available the highest quality. Use "1" for lowest quality.

‘<number>%’

Start the link that equals to <number>% in the list. Fractions are accepted - 34.56%, 18,6%.

‘format’

Preferred video format.

‘webm/mp4/flv/3gp/h264’

Auto-select the video format from the list of links (default mp4)

3.2 Automatic check for updates

Linterna Mágica checks for updates every time the configured interval is reached and at the first and second day after the exact match.

3.3 Disadvantages of the cookies hack

A weird hack to get data from YouTube and Dailymotion without cookies is used. With cookies the video link data is garbage for Linterna Mágica. Since version 0.0.11, the hack is not needed for YouTube, and it is not used.

First the cookies are removed by setting their expiration dates in the past. A request on the background (XMLHttpRequest) for the video page (for example watch?v=x) is made. The required data is extracted and the replacement video object is created. Cookies values can be saved before the request and restored later, but not their original expiration dates. Restored cookies will expire when the browser is closed. This hack might break login/favourites/recently watched and other features for sites supported this way. The browser will automatically set new values to some of the cookies with the background request.

3.4 Timed-out background requests

For Dailymotion you could use a timeout option. During the first tests of this fix there were some problems if the background request was made too soon. It seemed that not all cookies were set by the site and cleared by Linterna Mágica before the request. Later everything worked without timeout. If you have problems with Dailymotion increase the value for the “wait_xhr” option.

The wait_xhr option is effective for every site that is supported with background requests.

3.5 Localisation

In version 0.0.10 translations were split from the main userscript. Every localisation was a separate userscript with special structure. In version 0.0.11 userscript files are automatically generated form PO files. If there is translation for your language and you want to use it, you will have to build and install it. Compiled userscripts are also available at Linterna Mágica website.

By default Linterna Mágica tries to use the language of the browser interface if available. You could also set a custom locale by the “locale” config option.

To build all the localisation userscripts in the top source directory type:
‘make locales’

You could also build the scripts from the ‘po’ directory:
‘cd po’
‘make’

Compilation of userscript for single language is possible. To do so, type:
‘cd po’
‘make linternamagica_l10n_langcode.user.js’

Replace langcode in the example above with the code of the desired supported language.

3.6 Stop execution on every site

By default Linterna Mágica will run on every site. This is something that you might not like. You can configure it to run only on some pages. Open the source file and look for // @include http://*. Remove this and place the same statement for every site you wish to use Linterna Mágica with:

 // @include http://example.org
 // @include http://example2.org
 ...
 // @include http://exampleN.org

4. What is supported?

Linterna Mágica explicitly supports only free software browsers and plugins.

4.1 Supported extensions

The current versions of Linterna Mágica is tested and kept up to date with the following userscript extensions and implementations:

Greasemonkey

http://greasespot.net

Scriptish

http://scriptish.org/

Tampermonkey

http://tampermonkey.net/

Epiphany

Internal browser userscript implementation

Midori

Internal browser userscript implementation

4.2 Supported browsers

In this release (1.20) Linterna Mágica is tested and kept up to date with the following browsers:

Epiphany

Epiphany versions older than 2.30 might have problems with Greasemonkey.

Free software versions of Firefox

Free software versions of Firefox that support the Greasemonkey extension should work. Only GNU IceCat, Web Browser/ABrowser and Iceweasel are tested.

Midori

Chromium

Chromium is free software version of Google Chrome. Have in mind that this version has copyright issues and might not be entirely free software as well.

4.3 Supported plugins

Supported video plugins that can handle "video/flv" and "video/mp4" should work right away. Some plugins provide an API which is used in Linterna Mágica to support web controls, but this will require modifications to the code, if the plugin is not listed as supported. There is a configuration option to switch between controls provided by the plugin and Linterna Mágica.

These plugins are known to work:

Totem plugin

Versions older and equal to 2.30 does not have full API support for web controls. Newer versions of Totem have been patched and should work.

VLC plugin

No known problems.

gecko-mediaplayer plugin

Note: Have in mind that gecko-mediaplayer depends on mplayer for playback. Mplayer is free software by itself, but it can load and recommends binary only codecs. The completely free (as in freedom) distribution of GNU/Linux, Trisquel provides clean version of mplayer.

Xine plugin

No known problems.

4.4 Supported websites

Linterna Mágica is programmed in such a way that it might work (and it does) with web sites not specifically tested and supported. This is achieved by regular expressions, patterns and similarities between video sharing and posting sites. The main idea is that very little should be needed to support a new site - few changes in a regular expression, adding an address from where the clip should be extracted and so on.

There are more than 30 web sites, found with random web searches that are known to work. See the ‘WEBSITES’ file for all known working sites and more information.

4.5 Not supported

Web sites that use RTMP to transfer clips do not work.

Web sites that use clips and players from remote site do not work. For example YouTube video placed in a blog or a news article. Since version 0.0.9 some remote objects are detected and a link to the web page of the video is provided.

Linterna Mágica is not working with specific browser or plugin or operating system. Is it possible to support it?

Only free software will be supported. Explicit support for non-free software will not be provided. If Linterna Mágica is working with non-free software you must be very “lucky”. Yes, that is sarcasm!

5. Bugs

If you encounter bugs, or have suggestions of any kind, please report them at Linterna Mágica project page at Savannah https://savannah.nongnu.org/bugs/?group=linterna-magica. Use the “Bugs“ tracker, the “Tech Support Manager”/”Support” is now deprecated.

A. Copying this manual

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Version 3, 29 June 2007

Copyright © 2007 Free Software Foundation, Inc. http://fsf.org/

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   “Installation Information” for a User Product means any methods, procedures, authorization keys, or other information required to install and execute modified versions of a covered work in that User Product from a modified version of its Corresponding Source. The information must suffice to ensure that the continued functioning of the modified object code is in no case prevented or interfered with solely because modification has been made.

   If you convey an object code work under this section in, or with, or specifically for use in, a User Product, and the conveying occurs as part of a transaction in which the right of possession and use of the User Product is transferred to the recipient in perpetuity or for a fixed term (regardless of how the transaction is characterized), the Corresponding Source conveyed under this section must be accompanied by the Installation Information. But this requirement does not apply if neither you nor any third party retains the ability to install modified object code on the User Product (for example, the work has been installed in ROM).

   The requirement to provide Installation Information does not include a requirement to continue to provide support service, warranty, or updates for a work that has been modified or installed by the recipient, or for the User Product in which it has been modified or installed. Access to a network may be denied when the modification itself materially and adversely affects the operation of the network or violates the rules and protocols for communication across the network.

   Corresponding Source conveyed, and Installation Information provided, in accord with this section must be in a format that is publicly documented (and with an implementation available to the public in source code form), and must require no special password or key for unpacking, reading or copying.

8. Additional Terms.

   “Additional permissions” are terms that supplement the terms of this License by making exceptions from one or more of its conditions. Additional permissions that are applicable to the entire Program shall be treated as though they were included in this License, to the extent that they are valid under applicable law. If additional permissions apply only to part of the Program, that part may be used separately under those permissions, but the entire Program remains governed by this License without regard to the additional permissions.

   When you convey a copy of a covered work, you may at your option remove any additional permissions from that copy, or from any part of it. (Additional permissions may be written to require their own removal in certain cases when you modify the work.) You may place additional permissions on material, added by you to a covered work, for which you have or can give appropriate copyright permission.

   Notwithstanding any other provision of this License, for material you add to a covered work, you may (if authorized by the copyright holders of that material) supplement the terms of this License with terms:

   1. Disclaiming warranty or limiting liability differently from the terms of sections 15 and 16 of this License; or
   2. Requiring preservation of specified reasonable legal notices or author attributions in that material or in the Appropriate Legal Notices displayed by works containing it; or
   3. Prohibiting misrepresentation of the origin of that material, or requiring that modified versions of such material be marked in reasonable ways as different from the original version; or
   4. Limiting the use for publicity purposes of names of licensors or authors of the material; or
   5. Declining to grant rights under trademark law for use of some trade names, trademarks, or service marks; or
   6. Requiring indemnification of licensors and authors of that material by anyone who conveys the material (or modified versions of it) with contractual assumptions of liability to the recipient, for any liability that these contractual assumptions directly impose on those licensors and authors.

   All other non-permissive additional terms are considered “further restrictions” within the meaning of section 10. If the Program as you received it, or any part of it, contains a notice stating that it is governed by this License along with a term that is a further restriction, you may remove that term. If a license document contains a further restriction but permits relicensing or conveying under this License, you may add to a covered work material governed by the terms of that license document, provided that the further restriction does not survive such relicensing or conveying.

   If you add terms to a covered work in accord with this section, you must place, in the relevant source files, a statement of the additional terms that apply to those files, or a notice indicating where to find the applicable terms.

   Additional terms, permissive or non-permissive, may be stated in the form of a separately written license, or stated as exceptions; the above requirements apply either way.

9. Termination.

   You may not propagate or modify a covered work except as expressly provided under this License. Any attempt otherwise to propagate or modify it is void, and will automatically terminate your rights under this License (including any patent licenses granted under the third paragraph of section 11).

   However, if you cease all violation of this License, then your license from a particular copyright holder is reinstated (a) provisionally, unless and until the copyright holder explicitly and finally terminates your license, and (b) permanently, if the copyright holder fails to notify you of the violation by some reasonable means prior to 60 days after the cessation.

   Moreover, your license from a particular copyright holder is reinstated permanently if the copyright holder notifies you of the violation by some reasonable means, this is the first time you have received notice of violation of this License (for any work) from that copyright holder, and you cure the violation prior to 30 days after your receipt of the notice.

   Termination of your rights under this section does not terminate the licenses of parties who have received copies or rights from you under this License. If your rights have been terminated and not permanently reinstated, you do not qualify to receive new licenses for the same material under section 10.

10. Acceptance Not Required for Having Copies.

    You are not required to accept this License in order to receive or run a copy of the Program. Ancillary propagation of a covered work occurring solely as a consequence of using peer-to-peer transmission to receive a copy likewise does not require acceptance. However, nothing other than this License grants you permission to propagate or modify any covered work. These actions infringe copyright if you do not accept this License. Therefore, by modifying or propagating a covered work, you indicate your acceptance of this License to do so.

11. Automatic Licensing of Downstream Recipients.

    Each time you convey a covered work, the recipient automatically receives a license from the original licensors, to run, modify and propagate that work, subject to this License. You are not responsible for enforcing compliance by third parties with this License.

    An “entity transaction” is a transaction transferring control of an organization, or substantially all assets of one, or subdividing an organization, or merging organizations. If propagation of a covered work results from an entity transaction, each party to that transaction who receives a copy of the work also receives whatever licenses to the work the party’s predecessor in interest had or could give under the previous paragraph, plus a right to possession of the Corresponding Source of the work from the predecessor in interest, if the predecessor has it or can get it with reasonable efforts.

    You may not impose any further restrictions on the exercise of the rights granted or affirmed under this License. For example, you may not impose a license fee, royalty, or other charge for exercise of rights granted under this License, and you may not initiate litigation (including a cross-claim or counterclaim in a lawsuit) alleging that any patent claim is infringed by making, using, selling, offering for sale, or importing the Program or any portion of it.

12. Patents.

    A “contributor” is a copyright holder who authorizes use under this License of the Program or a work on which the Program is based. The work thus licensed is called the contributor’s “contributor version”.

    A contributor’s “essential patent claims” are all patent claims owned or controlled by the contributor, whether already acquired or hereafter acquired, that would be infringed by some manner, permitted by this License, of making, using, or selling its contributor version, but do not include claims that would be infringed only as a consequence of further modification of the contributor version. For purposes of this definition, “control” includes the right to grant patent sublicenses in a manner consistent with the requirements of this License.

    Each contributor grants you a non-exclusive, worldwide, royalty-free patent license under the contributor’s essential patent claims, to make, use, sell, offer for sale, import and otherwise run, modify and propagate the contents of its contributor version.

    In the following three paragraphs, a “patent license” is any express agreement or commitment, however denominated, not to enforce a patent (such as an express permission to practice a patent or covenant not to sue for patent infringement). To “grant” such a patent license to a party means to make such an agreement or commitment not to enforce a patent against the party.

    If you convey a covered work, knowingly relying on a patent license, and the Corresponding Source of the work is not available for anyone to copy, free of charge and under the terms of this License, through a publicly available network server or other readily accessible means, then you must either (1) cause the Corresponding Source to be so available, or (2) arrange to deprive yourself of the benefit of the patent license for this particular work, or (3) arrange, in a manner consistent with the requirements of this License, to extend the patent license to downstream recipients. “Knowingly relying” means you have actual knowledge that, but for the patent license, your conveying the covered work in a country, or your recipient’s use of the covered work in a country, would infringe one or more identifiable patents in that country that you have reason to believe are valid.

    If, pursuant to or in connection with a single transaction or arrangement, you convey, or propagate by procuring conveyance of, a covered work, and grant a patent license to some of the parties receiving the covered work authorizing them to use, propagate, modify or convey a specific copy of the covered work, then the patent license you grant is automatically extended to all recipients of the covered work and works based on it.

    A patent license is “discriminatory” if it does not include within the scope of its coverage, prohibits the exercise of, or is conditioned on the non-exercise of one or more of the rights that are specifically granted under this License. You may not convey a covered work if you are a party to an arrangement with a third party that is in the business of distributing software, under which you make payment to the third party based on the extent of your activity of conveying the work, and under which the third party grants, to any of the parties who would receive the covered work from you, a discriminatory patent license (a) in connection with copies of the covered work conveyed by you (or copies made from those copies), or (b) primarily for and in connection with specific products or compilations that contain the covered work, unless you entered into that arrangement, or that patent license was granted, prior to 28 March 2007.

    Nothing in this License shall be construed as excluding or limiting any implied license or other defenses to infringement that may otherwise be available to you under applicable patent law.

13. No Surrender of Others’ Freedom.

    If conditions are imposed on you (whether by court order, agreement or otherwise) that contradict the conditions of this License, they do not excuse you from the conditions of this License. If you cannot convey a covered work so as to satisfy simultaneously your obligations under this License and any other pertinent obligations, then as a consequence you may not convey it at all. For example, if you agree to terms that obligate you to collect a royalty for further conveying from those to whom you convey the Program, the only way you could satisfy both those terms and this License would be to refrain entirely from conveying the Program.

14. Use with the GNU Affero General Public License.

    Notwithstanding any other provision of this License, you have permission to link or combine any covered work with a work licensed under version 3 of the GNU Affero General Public License into a single combined work, and to convey the resulting work. The terms of this License will continue to apply to the part which is the covered work, but the special requirements of the GNU Affero General Public License, section 13, concerning interaction through a network will apply to the combination as such.

15. Revised Versions of this License.

    The Free Software Foundation may publish revised and/or new versions of the GNU General Public License from time to time. Such new versions will be similar in spirit to the present version, but may differ in detail to address new problems or concerns.

    Each version is given a distinguishing version number. If the Program specifies that a certain numbered version of the GNU General Public License “or any later version” applies to it, you have the option of following the terms and conditions either of that numbered version or of any later version published by the Free Software Foundation. If the Program does not specify a version number of the GNU General Public License, you may choose any version ever published by the Free Software Foundation.

    If the Program specifies that a proxy can decide which future versions of the GNU General Public License can be used, that proxy’s public statement of acceptance of a version permanently authorizes you to choose that version for the Program.

    Later license versions may give you additional or different permissions. However, no additional obligations are imposed on any author or copyright holder as a result of your choosing to follow a later version.

16. Disclaimer of Warranty.

    THERE IS NO WARRANTY FOR THE PROGRAM, TO THE EXTENT PERMITTED BY APPLICABLE LAW. EXCEPT WHEN OTHERWISE STATED IN WRITING THE COPYRIGHT HOLDERS AND/OR OTHER PARTIES PROVIDE THE PROGRAM “AS IS” WITHOUT WARRANTY OF ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. THE ENTIRE RISK AS TO THE QUALITY AND PERFORMANCE OF THE PROGRAM IS WITH YOU. SHOULD THE PROGRAM PROVE DEFECTIVE, YOU ASSUME THE COST OF ALL NECESSARY SERVICING, REPAIR OR CORRECTION.

17. Limitation of Liability.

    IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MODIFIES AND/OR CONVEYS THE PROGRAM AS PERMITTED ABOVE, BE LIABLE TO YOU FOR DAMAGES, INCLUDING ANY GENERAL, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THE USE OR INABILITY TO USE THE PROGRAM (INCLUDING BUT NOT LIMITED TO LOSS OF DATA OR DATA BEING RENDERED INACCURATE OR LOSSES SUSTAINED BY YOU OR THIRD PARTIES OR A FAILURE OF THE PROGRAM TO OPERATE WITH ANY OTHER PROGRAMS), EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES.

18. Interpretation of Sections 15 and 16.

    If the disclaimer of warranty and limitation of liability provided above cannot be given local legal effect according to their terms, reviewing courts shall apply local law that most closely approximates an absolute waiver of all civil liability in connection with the Program, unless a warranty or assumption of liability accompanies a copy of the Program in return for a fee.

END OF TERMS AND CONDITIONS

How to Apply These Terms to Your New Programs

If you develop a new program, and you want it to be of the greatest possible use to the public, the best way to achieve this is to make it free software which everyone can redistribute and change under these terms.

To do so, attach the following notices to the program. It is safest to attach them to the start of each source file to most effectively state the exclusion of warranty; and each file should have at least the “copyright” line and a pointer to where the full notice is found.

one line to give the program's name and a brief idea of what it does.
Copyright (C) year name of author

This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or (at
your option) any later version.

This program is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
General Public License for more details.

You should have received a copy of the GNU General Public License
along with this program.  If not, see http://www.gnu.org/licenses/.

Also add information on how to contact you by electronic and paper mail.

If the program does terminal interaction, make it output a short notice like this when it starts in an interactive mode:

program Copyright (C) year name of author
This program comes with ABSOLUTELY NO WARRANTY; for details type ‘show w’.
This is free software, and you are welcome to redistribute it
under certain conditions; type ‘show c’ for details.

The hypothetical commands ‘show w’ and ‘show c’ should show the appropriate parts of the General Public License. Of course, your program’s commands might be different; for a GUI interface, you would use an “about box”.

You should also get your employer (if you work as a programmer) or school, if any, to sign a “copyright disclaimer” for the program, if necessary. For more information on this, and how to apply and follow the GNU GPL, see http://www.gnu.org/licenses/.

The GNU General Public License does not permit incorporating your program into proprietary programs. If your program is a subroutine library, you may consider it more useful to permit linking proprietary applications with the library. If this is what you want to do, use the GNU Lesser General Public License instead of this License. But first, please read http://www.gnu.org/philosophy/why-not-lgpl.html.

A.2 GNU Free Documentation License

Version 1.3, 3 November 2008

Copyright © 2000, 2001, 2002, 2007, 2008 Free Software Foundation, Inc.
http://fsf.org/

Everyone is permitted to copy and distribute verbatim copies
of this license document, but changing it is not allowed.

1. PREAMBLE

   The purpose of this License is to make a manual, textbook, or other functional and useful document free in the sense of freedom: to assure everyone the effective freedom to copy and redistribute it, with or without modifying it, either commercially or noncommercially. Secondarily, this License preserves for the author and publisher a way to get credit for their work, while not being considered responsible for modifications made by others.

   This License is a kind of “copyleft”, which means that derivative works of the document must themselves be free in the same sense. It complements the GNU General Public License, which is a copyleft license designed for free software.

   We have designed this License in order to use it for manuals for free software, because free software needs free documentation: a free program should come with manuals providing the same freedoms that the software does. But this License is not limited to software manuals; it can be used for any textual work, regardless of subject matter or whether it is published as a printed book. We recommend this License principally for works whose purpose is instruction or reference.

2. APPLICABILITY AND DEFINITIONS

   This License applies to any manual or other work, in any medium, that contains a notice placed by the copyright holder saying it can be distributed under the terms of this License. Such a notice grants a world-wide, royalty-free license, unlimited in duration, to use that work under the conditions stated herein. The “Document”, below, refers to any such manual or work. Any member of the public is a licensee, and is addressed as “you”. You accept the license if you copy, modify or distribute the work in a way requiring permission under copyright law.

   A “Modified Version” of the Document means any work containing the Document or a portion of it, either copied verbatim, or with modifications and/or translated into another language.

   A “Secondary Section” is a named appendix or a front-matter section of the Document that deals exclusively with the relationship of the publishers or authors of the Document to the Document’s overall subject (or to related matters) and contains nothing that could fall directly within that overall subject. (Thus, if the Document is in part a textbook of mathematics, a Secondary Section may not explain any mathematics.) The relationship could be a matter of historical connection with the subject or with related matters, or of legal, commercial, philosophical, ethical or political position regarding them.

   The “Invariant Sections” are certain Secondary Sections whose titles are designated, as being those of Invariant Sections, in the notice that says that the Document is released under this License. If a section does not fit the above definition of Secondary then it is not allowed to be designated as Invariant. The Document may contain zero Invariant Sections. If the Document does not identify any Invariant Sections then there are none.

   The “Cover Texts” are certain short passages of text that are listed, as Front-Cover Texts or Back-Cover Texts, in the notice that says that the Document is released under this License. A Front-Cover Text may be at most 5 words, and a Back-Cover Text may be at most 25 words.

   A “Transparent” copy of the Document means a machine-readable copy, represented in a format whose specification is available to the general public, that is suitable for revising the document straightforwardly with generic text editors or (for images composed of pixels) generic paint programs or (for drawings) some widely available drawing editor, and that is suitable for input to text formatters or for automatic translation to a variety of formats suitable for input to text formatters. A copy made in an otherwise Transparent file format whose markup, or absence of markup, has been arranged to thwart or discourage subsequent modification by readers is not Transparent. An image format is not Transparent if used for any substantial amount of text. A copy that is not “Transparent” is called “Opaque”.

   Examples of suitable formats for Transparent copies include plain ASCII without markup, Texinfo input format, LaTeX input format, SGML or XML using a publicly available DTD, and standard-conforming simple HTML, PostScript or PDF designed for human modification. Examples of transparent image formats include PNG, XCF and JPG. Opaque formats include proprietary formats that can be read and edited only by proprietary word processors, SGML or XML for which the DTD and/or processing tools are not generally available, and the machine-generated HTML, PostScript or PDF produced by some word processors for output purposes only.

   The “Title Page” means, for a printed book, the title page itself, plus such following pages as are needed to hold, legibly, the material this License requires to appear in the title page. For works in formats which do not have any title page as such, “Title Page” means the text near the most prominent appearance of the work’s title, preceding the beginning of the body of the text.

   The “publisher” means any person or entity that distributes copies of the Document to the public.

   A section “Entitled XYZ” means a named subunit of the Document whose title either is precisely XYZ or contains XYZ in parentheses following text that translates XYZ in another language. (Here XYZ stands for a specific section name mentioned below, such as “Acknowledgements”, “Dedications”, “Endorsements”, or “History”.) To “Preserve the Title” of such a section when you modify the Document means that it remains a section “Entitled XYZ” according to this definition.

   The Document may include Warranty Disclaimers next to the notice which states that this License applies to the Document. These Warranty Disclaimers are considered to be included by reference in this License, but only as regards disclaiming warranties: any other implication that these Warranty Disclaimers may have is void and has no effect on the meaning of this License.

3. VERBATIM COPYING

   You may copy and distribute the Document in any medium, either commercially or noncommercially, provided that this License, the copyright notices, and the license notice saying this License applies to the Document are reproduced in all copies, and that you add no other conditions whatsoever to those of this License. You may not use technical measures to obstruct or control the reading or further copying of the copies you make or distribute. However, you may accept compensation in exchange for copies. If you distribute a large enough number of copies you must also follow the conditions in section 3.

   You may also lend copies, under the same conditions stated above, and you may publicly display copies.

4. COPYING IN QUANTITY

   If you publish printed copies (or copies in media that commonly have printed covers) of the Document, numbering more than 100, and the Document’s license notice requires Cover Texts, you must enclose the copies in covers that carry, clearly and legibly, all these Cover Texts: Front-Cover Texts on the front cover, and Back-Cover Texts on the back cover. Both covers must also clearly and legibly identify you as the publisher of these copies. The front cover must present the full title with all words of the title equally prominent and visible. You may add other material on the covers in addition. Copying with changes limited to the covers, as long as they preserve the title of the Document and satisfy these conditions, can be treated as verbatim copying in other respects.

   If the required texts for either cover are too voluminous to fit legibly, you should put the first ones listed (as many as fit reasonably) on the actual cover, and continue the rest onto adjacent pages.

   If you publish or distribute Opaque copies of the Document numbering more than 100, you must either include a machine-readable Transparent copy along with each Opaque copy, or state in or with each Opaque copy a computer-network location from which the general network-using public has access to download using public-standard network protocols a complete Transparent copy of the Document, free of added material. If you use the latter option, you must take reasonably prudent steps, when you begin distribution of Opaque copies in quantity, to ensure that this Transparent copy will remain thus accessible at the stated location until at least one year after the last time you distribute an Opaque copy (directly or through your agents or retailers) of that edition to the public.

   It is requested, but not required, that you contact the authors of the Document well before redistributing any large number of copies, to give them a chance to provide you with an updated version of the Document.

5. MODIFICATIONS

   You may copy and distribute a Modified Version of the Document under the conditions of sections 2 and 3 above, provided that you release the Modified Version under precisely this License, with the Modified Version filling the role of the Document, thus licensing distribution and modification of the Modified Version to whoever possesses a copy of it. In addition, you must do these things in the Modified Version:

   1. Use in the Title Page (and on the covers, if any) a title distinct from that of the Document, and from those of previous versions (which should, if there were any, be listed in the History section of the Document). You may use the same title as a previous version if the original publisher of that version gives permission.
   2. List on the Title Page, as authors, one or more persons or entities responsible for authorship of the modifications in the Modified Version, together with at least five of the principal authors of the Document (all of its principal authors, if it has fewer than five), unless they release you from this requirement.
   3. State on the Title page the name of the publisher of the Modified Version, as the publisher.
   4. Preserve all the copyright notices of the Document.
   5. Add an appropriate copyright notice for your modifications adjacent to the other copyright notices.
   6. Include, immediately after the copyright notices, a license notice giving the public permission to use the Modified Version under the terms of this License, in the form shown in the Addendum below.
   7. Preserve in that license notice the full lists of Invariant Sections and required Cover Texts given in the Document’s license notice.
   8. Include an unaltered copy of this License.
   9. Preserve the section Entitled “History”, Preserve its Title, and add to it an item stating at least the title, year, new authors, and publisher of the Modified Version as given on the Title Page. If there is no section Entitled “History” in the Document, create one stating the title, year, authors, and publisher of the Document as given on its Title Page, then add an item describing the Modified Version as stated in the previous sentence.
   10. Preserve the network location, if any, given in the Document for public access to a Transparent copy of the Document, and likewise the network locations given in the Document for previous versions it was based on. These may be placed in the “History” section. You may omit a network location for a work that was published at least four years before the Document itself, or if the original publisher of the version it refers to gives permission.
   11. For any section Entitled “Acknowledgements” or “Dedications”, Preserve the Title of the section, and preserve in the section all the substance and tone of each of the contributor acknowledgements and/or dedications given therein.
   12. Preserve all the Invariant Sections of the Document, unaltered in their text and in their titles. Section numbers or the equivalent are not considered part of the section titles.
   13. Delete any section Entitled “Endorsements”. Such a section may not be included in the Modified Version.
   14. Do not retitle any existing section to be Entitled “Endorsements” or to conflict in title with any Invariant Section.
   15. Preserve any Warranty Disclaimers.

   If the Modified Version includes new front-matter sections or appendices that qualify as Secondary Sections and contain no material copied from the Document, you may at your option designate some or all of these sections as invariant. To do this, add their titles to the list of Invariant Sections in the Modified Version’s license notice. These titles must be distinct from any other section titles.

   You may add a section Entitled “Endorsements”, provided it contains nothing but endorsements of your Modified Version by various parties—for example, statements of peer review or that the text has been approved by an organization as the authoritative definition of a standard.

   You may add a passage of up to five words as a Front-Cover Text, and a passage of up to 25 words as a Back-Cover Text, to the end of the list of Cover Texts in the Modified Version. Only one passage of Front-Cover Text and one of Back-Cover Text may be added by (or through arrangements made by) any one entity. If the Document already includes a cover text for the same cover, previously added by you or by arrangement made by the same entity you are acting on behalf of, you may not add another; but you may replace the old one, on explicit permission from the previous publisher that added the old one.

   The author(s) and publisher(s) of the Document do not by this License give permission to use their names for publicity for or to assert or imply endorsement of any Modified Version.

6. COMBINING DOCUMENTS

   You may combine the Document with other documents released under this License, under the terms defined in section 4 above for modified versions, provided that you include in the combination all of the Invariant Sections of all of the original documents, unmodified, and list them all as Invariant Sections of your combined work in its license notice, and that you preserve all their Warranty Disclaimers.

   The combined work need only contain one copy of this License, and multiple identical Invariant Sections may be replaced with a single copy. If there are multiple Invariant Sections with the same name but different contents, make the title of each such section unique by adding at the end of it, in parentheses, the name of the original author or publisher of that section if known, or else a unique number. Make the same adjustment to the section titles in the list of Invariant Sections in the license notice of the combined work.

   In the combination, you must combine any sections Entitled “History” in the various original documents, forming one section Entitled “History”; likewise combine any sections Entitled “Acknowledgements”, and any sections Entitled “Dedications”. You must delete all sections Entitled “Endorsements.”

7. COLLECTIONS OF DOCUMENTS

   You may make a collection consisting of the Document and other documents released under this License, and replace the individual copies of this License in the various documents with a single copy that is included in the collection, provided that you follow the rules of this License for verbatim copying of each of the documents in all other respects.

   You may extract a single document from such a collection, and distribute it individually under this License, provided you insert a copy of this License into the extracted document, and follow this License in all other respects regarding verbatim copying of that document.

8. AGGREGATION WITH INDEPENDENT WORKS

   A compilation of the Document or its derivatives with other separate and independent documents or works, in or on a volume of a storage or distribution medium, is called an “aggregate” if the copyright resulting from the compilation is not used to limit the legal rights of the compilation’s users beyond what the individual works permit. When the Document is included in an aggregate, this License does not apply to the other works in the aggregate which are not themselves derivative works of the Document.

   If the Cover Text requirement of section 3 is applicable to these copies of the Document, then if the Document is less than one half of the entire aggregate, the Document’s Cover Texts may be placed on covers that bracket the Document within the aggregate, or the electronic equivalent of covers if the Document is in electronic form. Otherwise they must appear on printed covers that bracket the whole aggregate.

9. TRANSLATION

   Translation is considered a kind of modification, so you may distribute translations of the Document under the terms of section 4. Replacing Invariant Sections with translations requires special permission from their copyright holders, but you may include translations of some or all Invariant Sections in addition to the original versions of these Invariant Sections. You may include a translation of this License, and all the license notices in the Document, and any Warranty Disclaimers, provided that you also include the original English version of this License and the original versions of those notices and disclaimers. In case of a disagreement between the translation and the original version of this License or a notice or disclaimer, the original version will prevail.

   If a section in the Document is Entitled “Acknowledgements”, “Dedications”, or “History”, the requirement (section 4) to Preserve its Title (section 1) will typically require changing the actual title.

10. TERMINATION

    You may not copy, modify, sublicense, or distribute the Document except as expressly provided under this License. Any attempt otherwise to copy, modify, sublicense, or distribute it is void, and will automatically terminate your rights under this License.

    However, if you cease all violation of this License, then your license from a particular copyright holder is reinstated (a) provisionally, unless and until the copyright holder explicitly and finally terminates your license, and (b) permanently, if the copyright holder fails to notify you of the violation by some reasonable means prior to 60 days after the cessation.

    Moreover, your license from a particular copyright holder is reinstated permanently if the copyright holder notifies you of the violation by some reasonable means, this is the first time you have received notice of violation of this License (for any work) from that copyright holder, and you cure the violation prior to 30 days after your receipt of the notice.

    Termination of your rights under this section does not terminate the licenses of parties who have received copies or rights from you under this License. If your rights have been terminated and not permanently reinstated, receipt of a copy of some or all of the same material does not give you any rights to use it.

11. FUTURE REVISIONS OF THIS LICENSE

    The Free Software Foundation may publish new, revised versions of the GNU Free Documentation License from time to time. Such new versions will be similar in spirit to the present version, but may differ in detail to address new problems or concerns. See http://www.gnu.org/copyleft/.

    Each version of the License is given a distinguishing version number. If the Document specifies that a particular numbered version of this License “or any later version” applies to it, you have the option of following the terms and conditions either of that specified version or of any later version that has been published (not as a draft) by the Free Software Foundation. If the Document does not specify a version number of this License, you may choose any version ever published (not as a draft) by the Free Software Foundation. If the Document specifies that a proxy can decide which future versions of this License can be used, that proxy’s public statement of acceptance of a version permanently authorizes you to choose that version for the Document.

12. RELICENSING

    “Massive Multiauthor Collaboration Site” (or “MMC Site”) means any World Wide Web server that publishes copyrightable works and also provides prominent facilities for anybody to edit those works. A public wiki that anybody can edit is an example of such a server. A “Massive Multiauthor Collaboration” (or “MMC”) contained in the site means any set of copyrightable works thus published on the MMC site.

    “CC-BY-SA” means the Creative Commons Attribution-Share Alike 3.0 license published by Creative Commons Corporation, a not-for-profit corporation with a principal place of business in San Francisco, California, as well as future copyleft versions of that license published by that same organization.

    “Incorporate” means to publish or republish a Document, in whole or in part, as part of another Document.

    An MMC is “eligible for relicensing” if it is licensed under this License, and if all works that were first published under this License somewhere other than this MMC, and subsequently incorporated in whole or in part into the MMC, (1) had no cover texts or invariant sections, and (2) were thus incorporated prior to November 1, 2008.

    The operator of an MMC Site may republish an MMC contained in the site under CC-BY-SA on the same site at any time before August 1, 2009, provided the MMC is eligible for relicensing.

ADDENDUM: How to use this License for your documents

To use this License in a document you have written, include a copy of the License in the document and put the following copyright and license notices just after the title page:

  Copyright (C)  year  your name.
  Permission is granted to copy, distribute and/or modify this document
  under the terms of the GNU Free Documentation License, Version 1.3
  or any later version published by the Free Software Foundation;
  with no Invariant Sections, no Front-Cover Texts, and no Back-Cover
  Texts.  A copy of the license is included in the section entitled ``GNU
  Free Documentation License''.

If you have Invariant Sections, Front-Cover Texts and Back-Cover Texts, replace the “with…Texts.” line with this:

    with the Invariant Sections being list their titles, with
    the Front-Cover Texts being list, and with the Back-Cover Texts
    being list.

If you have Invariant Sections without Cover Texts, or some other combination of the three, merge those two alternatives to suit the situation.

If your document contains nontrivial examples of program code, we recommend releasing these examples in parallel under your choice of free software license, such as the GNU General Public License, to permit their use in free software.

Index

Table of Contents

About This Document

This document was generated by Ivaylo Valkov on February 28, 2014 using texi2html 1.82.

The buttons in the navigation panels have the following meaning:

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• 1. Section One
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    • 1.2.1 Subsubsection One-Two-One
    • 1.2.2 Subsubsection One-Two-Two
    • 1.2.3 Subsubsection One-Two-Three     <== Current Position
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This document was generated by Ivaylo Valkov on February 28, 2014 using texi2html 1.82.