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| − | [[Category:Developer]]
| + | {{Software Project |
| − | [[Category:Metadata]]
| + | |Description=Low-level license metadata integration for applications. |
| − | [[Category:Desktop]]
| + | |Bug tracker=http://code.creativecommons.org/issues/issue?status=-1,1,2,3,4,5,6,7&@sort=-activity&@search_text=&@dispname=liblicense&@filter=status,project&@group=priority&project=4&@columns=id,activity,title,creator,assignedto,status&@pagesize=50&@startwith=0 |
| − | [[Category:Labs]]
| + | |Code repository=http://code.creativecommons.org/viewgit/liblicense.git/ |
| − | [[Category:Tools]]
| + | |Mailing list=http://lists.ibiblio.org/mailman/listinfo/cc-devel |
| − | [[Category:Specification]]
| + | }} |
| − | [[Category:Operating System]]
| + | == What is liblicense? == |
| − | [[Category:Technology]]
| |
| − | A library for managing license metadata, in particular CC licensing information.
| |
| − | | |
| − | The idea of this library started out on the [[IRC]] channel, in a discussion on how to best help boost the community of software
| |
| − | developers working with things related to CC - mostly the metadata format.
| |
| − | | |
| − | Basically, the idea is to write a portable C library that manages metadata for CC licenses, and a bunch of other licenses of interest to the community.
| |
| | | | |
| − | The library will produce licensing information based on the specifications of calling libraries and programs. In addition to generating text for specific licenses, it will also allow an application to enumerate which licenses are currently available and provide descriptive text for each license, and for license features. It should also provide an easy way to specify "verify at" URLs.
| + | liblicense provides a straight-forward way for developers to build license-aware applications. liblicense utilizes a pluggable module system for reading and writing metadata from specific file types, allowing extensibility for specific content types. |
| | | | |
| − | The benefit of this library is that applications linking to it can correctly offer licensing choices, and these choices can be transparently updated through package managers as license versions are updated. Human readable descriptions will also be internationalized, preferably using the same .po files used by the CC web site. Hence liblicense will take advantage of package updating and i18n systems to allow applications to always provide c
| + | * For a brief introduction video, check [http://blip.tv/file/1142312/ Asheesh Laroia talking about liblicense] |
| − | current and correct licensing choices and license text.
| + | * To see '''liblicense in action''' take a look at [[License tagger]], the cross platform file metadata editor. |
| | | | |
| − | Part of the project is also to provide wrappers for the library for other languages, and to help external developers add metadata support to their projects. A good start will probably be to wrap the library for Python, and use it for ccpublisher.
| + | == Features == |
| | | | |
| − | We will also integrate a module system so that libraries can be used to embed and extract metadata in/from common formats.
| + | * Extract and write license information for files |
| | + | * Supports enumeration of available licenses |
| | + | * Wraps internationalized license information for Creative Commons licenses |
| | + | * Bindings for dynamic languages (currently Python and Ruby) |
| | + | * Extensible support for file types using module system |
| | + | * No specific GUI library dependency allows applications to build the graphical chooser most appropriate for their platform. |
| | | | |
| − | As liblicense itself deals only with text strings, we can also make GUI libraries to provide dialogs which present these strings to the user in desktop or web applications. This layering ensures that such dialogs present consistent licensing choices.
| + | == Future Improvements == |
| | | | |
| − | == Get liblicense ==
| + | * Supports [[WebStatement|verification]] URLs for metadata verification |
| | | | |
| − | * [https://sourceforge.net/project/showfiles.php?group_id=80503&package_id=238700 Latest Release from Sourceforge.net]
| + | == Architecture == |
| − | * Checkout liblicense module from [[SVN]]
| |
| − | * Debian and Ubuntu [http://mirrors.creativecommons.org/packages/ repositories].
| |
| − | * Read the [[Liblicense tutorial| tutorial]].
| |
| − | | |
| − | === Screenshots ===
| |
| − | <gallery perrow="3">
| |
| − | Image:Ll nautilus emblem.png|Nautilus emblem support.
| |
| − | Image:Ll nautilus.png|Nautilus file properties.
| |
| − | Image:Ll default 2.png|GTK default system license.
| |
| − | Image:Ll dolphin.png|KDE4 dolphin file properties.
| |
| − | Image:Ll kde default license.png|KDE4 default system license.
| |
| − | </gallery>
| |
| − | | |
| − | == System Overview ==
| |
| − | | |
| − | === Purpose ===
| |
| − | To provide a simple way for developers to make their applications license aware. Additionally, supplemental modules aim to provide a method for users to track licenses of files on their system. This project complements [[Companion File metadata specification]] and [[Tracker CC Indexing]].
| |
| − | | |
| − | === Architecture ===
| |
| | [[Image:System_architecture.png]] | | [[Image:System_architecture.png]] |
| | | | |
| − | === Implementation ===
| + | [[:Image:System_architecture.svg|Liblicense Architecture - SVG]] |
| − | This library is implemented in C to allow for maximum portability.
| |
| | | | |
| − | === Interface === | + | == Bindings == |
| − | Note: All functions prepended with ll_ in C. The header file is liblicense.h .
| |
| − | * get_config_modules() - ''returns a null terminates list of available config modules.''
| |
| − | * get_io_modules() - ''returns a null terminates list of available io modules.''
| |
| − | * get_module_symbol(module,symbol) - ''returns the requested symbol.''
| |
| − | * module_init(module) - ''Loads the module and calls its init function.''
| |
| − | * module_shutdown(module) - ''Calls the shutdown method of the module and unloads it.''
| |
| − | * io_module_mime_types(module0 - ''returns a null-terminated list of the supported mime-types.''
| |
| − | * read(filename) - ''returns the uri of the license of the given file.''
| |
| − | * module_read(filename,module) - ''returns the uri of the license of the given file while using the given module.''
| |
| − | * write(filename,uri) - ''writes the given license to the given file using all applicable modules.''
| |
| − | * module_write(filename,module,uri) - ''writes the given license to the given file using the given module.''
| |
| − | * set_default(uri)
| |
| − | * get_default()
| |
| − | * get_jurisdiction(uri) - ''returns the jurisdiction for the given license.''
| |
| − | * get_name(uri) – ''returns the name of the license.''
| |
| − | * get_version(uri) – ''returns the version of the license.''
| |
| − | * get_prohibits(uri)
| |
| − | * get_permits(uri)
| |
| − | * get_requires(uri)
| |
| − | * verify_uri(uri) - ''returns whether or not the given uri is recognized by the system.''
| |
| − | * get_all_licenses() - ''returns a list of all general license uris available for new works.''
| |
| − | * get_licenses(juris_t) - ''returns alist of all general licenses in a family.''
| |
| − | * get_jurisdictions() - ''returns a list of all jurisdictions.''
| |
| − | * jurisdiction_name(juris_t) - ''returns the name of the given jurisdiction.''
| |
| − | * new_license_chooser(juris_t,char**attributes) - ''creates a structure for searching for licenses based on the given attributes''
| |
| − | * get_licenses_from_flags(ll_license_chooser_t*,int permits, int requires, int prohibits) - ''returns a linked-list of matching licenses. The flags given should be OR'ed together and come from the result of ll_attribute_flag()''
| |
| | | | |
| − | Note: Before using the library in C you must call ll_init() and when done call ll_stop().
| + | * [[Liblicense/Python|Python]] |
| − | ==== C List helpers ====
| + | * [[Liblicense/Ruby|Ruby]] |
| − | Liblicense lists are arrays ended with NULL. | |
| − | * char** ll_new_list(int length) - ''returns a new list of the given size.'' | |
| − | * void ll_free_list(char** list) - ''frees the list and its char*s.''
| |
| − | * int ll_list_contains(char** haystack,char* needle) - ''returns 1 if the needle is found in the haystack and 0 otherwise.''
| |
| − | * int ll_list_index(char** haystack,char* needle) - ''returns the index of the needle in the haystack and -1 otherwise.''
| |
| − | * int ll_list_length(char** list) - ''returns the length of the list.''
| |
| − | * char* ll_list_mode(char** list,char* ignore) - ''returns a reference to the first occurance of the most abundant char* (by value not pointer) in the list besides the ignore char*.''
| |
| − | * void ll_list_print(char** list) - ''prints the list to stdout.''
| |
| | | | |
| − | === Config Modules === | + | == Media == |
| − | * '''init'''() - starts the module
| |
| − | * '''shutdown'''() - shuts the module down
| |
| − | * '''get'''() - returns the current default license uri
| |
| − | * '''set'''(uri) - sets the default license uri and returns 0 upon success (non-zero for errors)
| |
| | | | |
| − | === I/O Modules ===
| + | See [[Operating System Mockups]] for ideas on how '''liblicense''' could be integrated into various platforms. |
| − | I/O modules are shared objects that call LL_MODULE_DEFINE(name,description,version,features,mime_types,init_func,read_func,write_func).
| |
| | | | |
| − | * '''name'''
| + | == Download == |
| − | * '''description'''
| |
| − | * '''version'''
| |
| − | * '''features''' - If the module embeds the license within the file, pass LL_FEATURES_EMBED
| |
| − | * '''mime_types''' - A space-separated string of supported mime-types, or NULL if mime-type agnostic (i.e. XMP sidecar)
| |
| − | * '''init_func''' - This function will be called once before the module is used
| |
| − | * '''read_func''' - Function to be called when requested to read a license from a file. It takes a filename and returns the license URI, or NULL if no license is present. Should return an 'int' indicating success or failure.
| |
| − | * '''write_func''' - Function to be called when requested to write a license to a file. The first parameter is the filename and the second is the license URI to write. Should return an 'int' indicating success or failure.
| |
| | | | |
| − | === Bindings ===
| + | * [http://mirrors.creativecommons.org/software/liblicense/liblicense-0.8.1.tar.gz Latest Release tar.gz] |
| − | *Python | + | * Debian and Ubuntu [http://mirrors.creativecommons.org/packages/ repositories]. |
| − | *Ruby | + | * Read the [[Liblicense tutorial| tutorial]]. |
| | | | |
| − | == License Files (.rdf) == | + | === Developers: Using git === |
| − | === Attributes ===
| |
| | | | |
| − | * cc:license
| + | If you want to check out the source code and develop on it, use this command: |
| − | ** about
| |
| − | ** permits
| |
| − | ** requires
| |
| − | ** prohibits
| |
| − | * dc:title - The human readable name of the license.
| |
| − | * dc:description - Description of the license.
| |
| − | * dc:coverage - The jurisdiction of the license. (country code from [http://www.iso.org/iso/en/prods-services/iso3166ma/02iso-3166-code-lists/list-en1.html ISO3166])
| |
| − | * dc:relation
| |
| − | ** hasVersion - version number
| |
| − | ** isReplacedBy - indicates retired license ([http://www.ietf.org/rfc/rfc2396.txt URI])
| |
| − | ** isBasedOn - indicates ported version ([http://www.ietf.org/rfc/rfc2396.txt URI])
| |
| − | * dc:type - always "License"
| |
| − | * dc:creator
| |
| − | * dc:publisher
| |
| − | * dc:identifier - URI of license ([http://www.ietf.org/rfc/rfc2396.txt URI])
| |
| | | | |
| − | === Example ===
| + | git clone git://code.creativecommons.org/liblicense.git |
| − | <pre><rdf:RDF
| + | git submodule init |
| − | xmlns="http://creativecommons.org/ns#"
| + | git submodule update |
| − | xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#"
| |
| − | xmlns:dc="http://purl.org/dc/elements/1.1/"
| |
| − | xmlns:dcq="http://purl.org/dc/terms/"
| |
| − | >
| |
| − | <rdf:Description rdf:about="http://creativecommons.org/licenses/by-nd/2.0/za/">
| |
| − | <dc:title>Creative Commons Attribution No Derivatives</dc:title>
| |
| − | <dc:description>This license allows for redistribution, commercial and non-commercial,
| |
| − | as long as it is passed along unchanged and in whole, with credit to you.</dc:description> | |
| − | <dc:coverage>
| |
| − | <dcq:ISO3166>
| |
| − | <rdf:value>za</rdf:value>
| |
| − | </dcq:ISO3166>
| |
| − | </dc:coverage>
| |
| − | <dc:hasVersion>2.0</dc:hasVersion>
| |
| − | <dc:isReplacedBy>
| |
| − | <dcq:URI>
| |
| − | <rdf:value>http://creativecommons.org/licenses/by-nd/2.5/za/</rdf:value>
| |
| − | </dcq:URI>
| |
| − | </dc:isReplacedBy>
| |
| − | <dc:isBasedOn>
| |
| − | <dcq:URI>
| |
| − | <rdf:value>http://creativecommons.org/licenses/by-nd/2.5/</rdf:value>
| |
| − | </dcq:URI>
| |
| − | </dc:isBasedOn>
| |
| − | <dc:type>License</dc:type>
| |
| − | <dc:creator>iCommons</dc:creator>
| |
| − | <dc:publisher>Creative Commons</dc:publisher>
| |
| − | <dc:identifier>http://creativecommons.org/licenses/by-nd/2.0/za/</dc:identifier>
| |
| | | | |
| − | <rdf:type rdf:resource="http://creativecommons.org/ns#License"/>
| + | That should give you a working copy you can commit to. In case you wonder: the latter two commandsfill the directories |
| − | <permits rdf:resource="http://creativecommons.org/ns#Distribution"/>
| + | * icons/jurisdictions |
| − | <permits rdf:resource="http://creativecommons.org/ns#Reproduction"/>
| + | * license.rdf |
| − | <requires rdf:resource="http://creativecommons.org/ns#Attribution"/>
| + | * licenses |
| − | <requires rdf:resource="http://creativecommons.org/ns#Notice"/>
| + | with content from external repositories similar to ''svn:externals'' for Subversion. |
| − | </rdf:Description>
| |
| − | </rdf:RDF></pre>
| |
| | | | |
| − | === Example (i18n) === | + | == More Information == |
| − | <pre><rdf:RDF
| |
| − | xmlns="http://creativecommons.org/ns#"
| |
| − | xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#"
| |
| − | xmlns:dc="http://purl.org/dc/elements/1.1/"
| |
| − | xmlns:dcq="http://purl.org/dc/terms/"
| |
| − | >
| |
| − | <rdf:Description rdf:about="http://creativecommons.org/licenses/by-nd/2.0/">
| |
| − | <dc:title>
| |
| − | <rdf:Alt>
| |
| − | <rdf:li xml:lang="x-default">Creative Commons Attribution No Derivatives</rdf:li>
| |
| − | <rdf:li xml:lang="es-cl">Creative Commons Atribución-SinDerivadas</rdf:li>
| |
| − | </rdf:Alt>
| |
| − | </dc:title>
| |
| − | <dc:description>
| |
| − | <rdf:Alt>
| |
| − | <rdf:li xml:lang="x-default">This license allows for redistribution, commercial and non-commercial,
| |
| − | as long as it is passed along unchanged and in whole, with credit to you.</rdf:li>
| |
| − | </rdf:Alt>
| |
| − | </dc:description>
| |
| − | <dc:coverage>
| |
| − | <dcq:ISO3166>
| |
| − | <rdf:value>us</rdf:value>
| |
| − | </dcq:ISO3166>
| |
| − | </dc:coverage>
| |
| − | <dc:hasVersion>2.0</dc:hasVersion>
| |
| − | <dc:isReplacedBy>
| |
| − | <dcq:URI>
| |
| − | <rdf:value>http://creativecommons.org/licenses/by-nd/2.5/</rdf:value>
| |
| − | </dcq:URI>
| |
| − | </dc:isReplacedBy>
| |
| − | <dc:type>License</dc:type>
| |
| − | <dc:creator>Creative Commons</dc:creator>
| |
| − | <dc:publisher>Creative Commons</dc:publisher>
| |
| − | <dc:identifier>http://creativecommons.org/licenses/by-nd/2.0/</dc:identifier>
| |
| | | | |
| − | <rdf:type rdf:resource="http://creativecommons.org/ns#License"/>
| + | * [[Liblicense/Releases|Release History]] and [[Liblicense/Roadmap|Roadmap]] |
| − | <permits rdf:resource="http://creativecommons.org/ns#Distribution"/>
| + | * [[Liblicense/Desktop_Integration|Desktop Integration]] |
| − | <permits rdf:resource="http://creativecommons.org/ns#Reproduction"/>
| + | * [[Liblicense/Screenshots|Screenshots]] |
| − | <requires rdf:resource="http://creativecommons.org/ns#Attribution"/>
| + | * [[License RDF|RDF Reference]] |
| − | <requires rdf:resource="http://creativecommons.org/ns#Notice"/>
| + | * [[Liblicense/Metadata_Table|File Metadata Information]] |
| − | </rdf:Description>
| + | * [http://code.creativecommons.org/doc/liblicense/ Library Documentation] (generated from source) |
| − | </rdf:RDF></pre>
| + | * [[Buildbot]] helps test out liblicense on various platforms. |
| | | | |
| − | == Desktop Integration == | + | == See Also == |
| | | | |
| − | See [[Desktop Integration]]
| + | * [[Companion File metadata specification]] |
| | + | * [[Tracker CC Indexing]] - also there is a great chart showing progress on reading/writing different filetypes (copied above). |
| | | | |
| − | === Gnome Summit Discussion ===
| + | {{Challenge Enabled}} |
| | | | |
| − | At the Gnome Summit we explored adding CC licensing to various Gnome applications. Application developers appeared to have a few needs:
| + | [[Category:Developer]] |
| − | | + | [[Category:Metadata]] |
| − | * They want to display the appropriate icon (or other) for a particular license. For instance, AbiWord could display a small icon representing license status in the tool bar. Music players could display the icon in the controls area. A music streaming app might want to play a 5 second "Now entering the Creative Commons" chime (much like radio station identification, but for licenses).
| + | [[Category:Desktop]] |
| − | * They want to allow the user to easily select a license. This would probably be a wizard that asks the user questions and tries to select the most appropriate license from all that it knows about. Much like a file selection dialog, but navigating licenses instead of your file system.
| + | [[Category:Labs]] |
| − | | + | [[Category:Tools]] |
| − | A low-level liblicense could handle XML parsing required. It would allow the client to determine the questions that need to be asked to select a license, and to download any icons, blurbs, etc for all known license types.
| + | [[Category:Specification]] |
| − | | + | [[Category:Operating System]] |
| − | The low-level library solves the first problem above, but not the second. It's still too difficult to ask the user to select a license. Layered on top of the low-level library would be any number of high level libraries that would convert the textual questions into GUI widgets and present them using the appropriate toolkit (GTK+ / KDE / Cocoa / Win32 / etc). This way, adding license awareness to an application should be as easy as "license=SFGetLicense(); saveDocument(license)".
| + | [[Category:Technology]] |
| − | | + | [[Category:Integration]] |
| − | === Accessories ===
| |
| − | * CLI
| |
| − | ** license (bundled) - simple cli program to license files.
| |
| − | ** .license/default engine - a .license directory will contain the user's default setting, other config info and the user's licenses.
| |
| − | * Gnome
| |
| − | ** Gnome Settings frontend. - set the default license through the gnome settings interface.
| |
| − | ** Nautilus Frontend Extension - set and read licenses through nautilus.
| |
| − | ** License chooser (app.) - license chooser for setting default and per file licenses. (GUI license)
| |
| − | ** GTK widget
| |
| − | ** Gconf config module.
| |
| − | * Sugar
| |
| − | ** Journal Backend
| |
| − | ** Journal Frontend
| |
| − | * KDE3 (???)
| |
| − | * KDE4
| |
| − | | |
| − | | |
| − | | |
| − | == Roadmap ==
| |
| − | === 0.1 ===
| |
| − | * Initial release. ('''done''')
| |
| − | * All CC licenses. ('''done''')
| |
| − | * CLI tools. ('''done''')
| |
| − | * Modules. ('''done''')
| |
| − | ** Exempi embed. ('''done''')
| |
| − | ** Exempi XMP sidecar. ('''done''')
| |
| − | * Make light blog post about release on techblog, explain early state ('''done''')
| |
| − | | |
| − | === 0.3 ===
| |
| − | * Optimization - namely caching in some way. Should not access file every attribute request.
| |
| − | * Gnome tools. ('''done''')
| |
| − | ** Nautilus frontend. ('''done''')
| |
| − | ** Gnome settings frontend. ('''done''')
| |
| − | ** GTK License chooser. (See mockups) ('''done''')
| |
| − | * File embed preference over external storage. (Use external only as needed.) ('''done''')
| |
| − | * Store default jurisdiction. ('''done - default license is in default jurisdiction''')
| |
| − | * Modules.
| |
| − | ** vorbiscomment ('''done''')
| |
| − | ** ...
| |
| − | * Do big release on main CC blog and across various chat and mailing lists to pick-up people, lots of them...
| |
| − | * Do [[liblicense 03 release todo]]
| |
| − | | |
| − | === 0.4 ===
| |
| − | * Further refinement.
| |
| − | * Sugar tools.
| |
| − | ** Journal integration.
| |
| − | * Another major announcement
| |
| − | * [[liblicense 04 release todo]]
| |
| − | | |
| − | === 0.5 ===
| |
| − | | |
| − | * more!
| |
| − | | |
| − | === 0.6 ===
| |
| − | | |
| − | * more!
| |
| − | | |
| − | === 0.7 ===
| |
| − | | |
| − | * more!
| |
| − | | |
| − | === 0.8 ===
| |
| − | | |
| − | * more!
| |
| − | | |
| − | === 0.9 ===
| |
| − | | |
| − | * more!
| |
| − | | |
| − | === 1.0 ===
| |
| | | | |
| − | * more!
| + | __NOTOC__ |
| | + | {{lowercase}} |
