Copyleft

Copyleft works can be shared both in original form and after being adapted, but they must remain under the copyleft licence even if they are modified.

Copyleft licences are also called 'reciprocal', 'viral' and 'share alike' libre licences. However, whereas copyleft can only describe a libre work, the other three terms can also describe proprietary works that must be kept under the same (proprietary) licence when adapted.

Openness: Libre

Works and Sources

Works

• Xochitlcozamalotl ● Aztec daisies, god-rabbits and divine parties meet in this Aztec soap opera.
• Yags ● A moderately crunchy cinematic rules system.
• Yanone Kaffeesatz ● The first font completed by Yanone.
• Ye Olde Adventure Shoppe ● A proof of concept for an HTML5 game for the Liberated Pixel Cup.
• Yo Frankie! ● A computer game where you control a rodent.
• Yorokobu ● A Spanish language magazine about innovation, inspiration, trends, sustainability and the adventures of entrepreneurs.
• You All Meet In A Tavern ● 'As a fledgling adventurer you have decided that the best way to get into the business is by attending the monthly Adventurer-Nite at the local White Griffon Tavern.'
• ZeFRS ● A retroclone of TSR's Conan RPG.

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Sources

• Qi Hardware ● 'Qi's mission is to promote and encourage the development of copyleft hardware.'
• Qomun ● A directory of shareable works.
• Radio Nowhere ● 'Radio Nowhere is a rock/pop band from Oakland, California, in the United States. A friend told me that we sound like the missing link between Counting Crows and Duran Duran, and that sums it up pretty well.'
• Rafu ● Rafu, or Raffaele Manzo, is a game designer.
• Ronin Arts ● A publisher.
• Ryzom Asset Repository ● 3D assets from the MMORPG Ryzom.
• Sand & Steam ● An RPG company.
• Severed Fifth ● A band.
• SIL International ● An organisation which supports language communities
• Simone Aliprandi ● A researcher into copyright.
• Slim ● A band.
• Software Freedom Conservancy ● 'Software Freedom Conservancy is a not-for-profit organization that helps promote, improve, develop, and defend Free, Libre, and Open Source Software (FLOSS) projects.'
• Stuart Chaplin ● Story game author.
• Subaqueous ● 'Subaqueous is a solo music project of Isaac Cotec. The music has incorporated beat science to create progressive mid tempo and dance music.'
• Sunspot ● 'Disco-Metal Rock from the Cheese and Beer Galaxy'
• Teapot Dome Games ● A publisher of free role-playing games.
• Tenpenny Joke ● An alternative rock band.
• The SCP Foundation ● X-Files like wiki.
• Traficantes de Sueños ● A Spanish book publisher.
• (un)Playable_G4mes ● 'Where game ideas come to die'
• Wikipedia List of Game Engines ● A list of game engines on Wikipedia.
• Wizards of the Coast ● A game publisher.
• Yanone ● A young German jack-of-all-trades.
• Zadkiel ● 'Zadkiel are three piece Alternative-Rock/Indie band from Nottingham.'

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Licences

• CERN Open Hardware License ● 'In the spirit of knowledge sharing and dissemination, the CERN Open Hardware Licence (CERN OHL) governs the use, copying, modification and distribution of hardware design documentation, and the manufacture and distribution of products.'
• Creative Commons Attribution-ShareAlike ● A Creative Commons licence which allows copying provided credit is given and adaptations fall under the same licence.
• Creative Commons ShareAlike ● A retired Creative Commons licence.
• Free Art License ● A copyleft licence designed specifically for art.
• GNU Affero General Public License ● A copyleft software licence.
• GNU Free Documentation License ● A copyleft licence for manuals and software guides.
• GNU General Public License ● A copyleft licence designed for software.
• GNU Lesser General Public License ● A free software licence.
• Open Data Commons Open Database License ● A copyleft licence for databases.
• Open Game License ● A copyleft licence designed for games but usable elsewhere.
• Open Hardware License ● A couple of libre hardware licences.
• SIL Open Font License ● A copyleft font licence.
• TAPR Open Hardware License ● 'The TAPR Open Hardware License is TAPR's contribution to the community of Open Hardware developers.'

• Basic Dungeons & Dragons ● The mechanics of original and basic D&D.
• CC-PRO ● A rebranding of the CC BY-SA licence to emphasise its value to professionals.
• d20 System ● The roleplaying system which first appeared in Dungeons & Dragons 3E.
• FATE ● A game system based on the mechanic: dice roll + invoked and tagged Aspects.
• Liberated Pixel Cup ● "Liberated Pixel Cup is a two-part competition: make a bunch of awesome free culture licensed artwork, and then program a bunch of free software games that use it."
• Saga Machine ● 'Saga Machine is a brand new tabletop role-playing system by the Tab Creations Collective.'