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Following the SysCon of 2016-05-24, CC0 (Public Domain) has been voted as the favored license for yunity content.

Summary of CC0 (Public Domain)

The person who associated a work with this deed has dedicated the work to the public domain by waiving all of his or her rights to the work worldwide under copyright law, including all related and neighboring rights, to the extent allowed by law.
You can copy, modify, distribute and perform the work, even for commercial purposes, all without asking permission.
In no way are the patent or trademark rights of any person affected by CC0, nor are the rights that other persons may have in the work or in how the work is used, such as publicity or privacy rights.
Unless expressly stated otherwise, the person who associated a work with this deed makes no warranties about the work, and disclaims liability for all uses of the work, to the fullest extent permitted by applicable law.
When using or citing the work, you should not imply endorsement by the author or the affirmer.

(From https://creativecommons.org/publicdomain/zero/1.0/)

Legal Code

Statement of Purpose

The laws of most jurisdictions throughout the world automatically confer exclusive Copyright and Related Rights (defined below) upon the creator and subsequent owner(s) (each and all, an "owner") of an original work of authorship and/or a database (each, a "Work").

Certain owners wish to permanently relinquish those rights to a Work for the purpose of contributing to a commons of creative, cultural and scientific works ("Commons") that the public can reliably and without fear of later claims of infringement build upon, modify, incorporate in other works, reuse and redistribute as freely as possible in any form whatsoever and for any purposes, including without limitation commercial purposes. These owners may contribute to the Commons to promote the ideal of a free culture and the further production of creative, cultural and scientific works, or to gain reputation or greater distribution for their Work in part through the use and efforts of others.

For these and/or other purposes and motivations, and without any expectation of additional consideration or compensation, the person associating CC0 with a Work (the "Affirmer"), to the extent that he or she is an owner of Copyright and Related Rights in the Work, voluntarily elects to apply CC0 to the Work and publicly distribute the Work under its terms, with knowledge of his or her Copyright and Related Rights in the Work and the meaning and intended legal effect of CC0 on those rights.

1. Copyright and Related Rights. A Work made available under CC0 may be protected by copyright and related or neighboring rights ("Copyright and Related Rights"). Copyright and Related Rights include, but are not limited to, the following:

the right to reproduce, adapt, distribute, perform, display, communicate, and translate a Work;
moral rights retained by the original author(s) and/or performer(s);
publicity and privacy rights pertaining to a person's image or likeness depicted in a Work;
rights protecting against unfair competition in regards to a Work, subject to the limitations in paragraph 4(a), below;
rights protecting the extraction, dissemination, use and reuse of data in a Work;
database rights (such as those arising under Directive 96/9/EC of the European Parliament and of the Council of 11 March 1996 on the legal protection of databases, and under any national implementation thereof, including any amended or successor version of such directive); and
other similar, equivalent or corresponding rights throughout the world based on applicable law or treaty, and any national implementations thereof.

2. Waiver. To the greatest extent permitted by, but not in contravention of, applicable law, Affirmer hereby overtly, fully, permanently, irrevocably and unconditionally waives, abandons, and surrenders all of Affirmer's Copyright and Related Rights and associated claims and causes of action, whether now known or unknown (including existing as well as future claims and causes of action), in the Work (i) in all territories worldwide, (ii) for the maximum duration provided by applicable law or treaty (including future time extensions), (iii) in any current or future medium and for any number of copies, and (iv) for any purpose whatsoever, including without limitation commercial, advertising or promotional purposes (the "Waiver"). Affirmer makes the Waiver for the benefit of each member of the public at large and to the detriment of Affirmer's heirs and successors, fully intending that such Waiver shall not be subject to revocation, rescission, cancellation, termination, or any other legal or equitable action to disrupt the quiet enjoyment of the Work by the public as contemplated by Affirmer's express Statement of Purpose.

3. Public License Fallback. Should any part of the Waiver for any reason be judged legally invalid or ineffective under applicable law, then the Waiver shall be preserved to the maximum extent permitted taking into account Affirmer's express Statement of Purpose. In addition, to the extent the Waiver is so judged Affirmer hereby grants to each affected person a royalty-free, non transferable, non sublicensable, non exclusive, irrevocable and unconditional license to exercise Affirmer's Copyright and Related Rights in the Work (i) in all territories worldwide, (ii) for the maximum duration provided by applicable law or treaty (including future time extensions), (iii) in any current or future medium and for any number of copies, and (iv) for any purpose whatsoever, including without limitation commercial, advertising or promotional purposes (the "License"). The License shall be deemed effective as of the date CC0 was applied by Affirmer to the Work. Should any part of the License for any reason be judged legally invalid or ineffective under applicable law, such partial invalidity or ineffectiveness shall not invalidate the remainder of the License, and in such case Affirmer hereby affirms that he or she will not (i) exercise any of his or her remaining Copyright and Related Rights in the Work or (ii) assert any associated claims and causes of action with respect to the Work, in either case contrary to Affirmer's express Statement of Purpose.

4. Limitations and Disclaimers.

No trademark or patent rights held by Affirmer are waived, abandoned, surrendered, licensed or otherwise affected by this document.
Affirmer offers the Work as-is and makes no representations or warranties of any kind concerning the Work, express, implied, statutory or otherwise, including without limitation warranties of title, merchantability, fitness for a particular purpose, non infringement, or the absence of latent or other defects, accuracy, or the present or absence of errors, whether or not discoverable, all to the greatest extent permissible under applicable law.
Affirmer disclaims responsibility for clearing rights of other persons that may apply to the Work or any use thereof, including without limitation any person's Copyright and Related Rights in the Work. Further, Affirmer disclaims responsibility for obtaining any necessary consents, permissions or other rights required for any use of the Work.
Affirmer understands and acknowledges that Creative Commons is not a party to this document and has no duty or obligation with respect to this CC0 or use of the Work.

(From https://creativecommons.org/publicdomain/zero/1.0/legalcode)

Wiki licensing

On the starting page, contributors are informed that the yunity wiki is licensed under CC0 and they need to agree that all their contributions will be too.

The following waiver is displayed on all wiki pages:

Copyright waiver

To the extent possible under law, the yunity wiki contributors have waived all copyright and related or neighboring rights to the content of the yunity wiki.

Image/Video licensing

Tell creators/photographers/designers to use only CC0-compatible material. Tell them that their work will also be cc0ed (yep, it’s a verb now)

For the past content someone would have to check how much work it would be to ask everyone involved and if there is copyrighted or cc-by stuff in there and than see if it’s worth the effort! (might not be in most cases) for videos it can be a lot of effort: music, actors, etc.

Limitations

In many jurisdictions people have "the right at the own picture“ (means different things, but means you should probably ask if CC0 is cool for them)
Trademarks, logos, money, registered design, some architecture, emblems and stuff is protected and can probably not be cc0ed
Wikimedia commons has a lot of information on those details (e.g. https://commons.wikimedia.org/wiki/Commons:Reusing_content_outside_Wikimedia)

Questions & Answers

Can we license a page with an attributed excerpt as CC0? Example: https://yunity.atlassian.net/wiki/display/YUN/Agile
What about copy-pasted text, linked images, images that aren't ours, etc.

Real Quotes should be fine anyway. For all other stuff that is not ours: mark it with the right license and put something like "cc0 license license unless otherwise marked"

Can we just draft the same contributors agreement for past. present and future contributions, then send the same thing to everyone?

Should work. Maybe change the tenses ;)

Should we need to watermark images/videos in some way to make?

It usually not necessary to watermark files. The license is valid even when it's e.g. in the youtube description. But it might be a nice place to boost cc-licenses and the own name.

Especially with pictures I would say from a designers perspective to leave watermarks out for better image manipulation.

Open Tasks

Investigate whether confluence has feature to facilitate new contributors signing license agreement.
Write to anyone who's written in the wiki for their active agreement.
We can notice everyone in design, core and other relevant teams (better a bit more than too little) in slack and Trello that the CC0 will be implemented in the wiki and that all content that gets another copyright is marked until then.
Draft text for people joining wiki to let them know their contributions will be CC0. This text should include link to license and some way for to demonstrate active agreement.

Agreement text (Draft)

Intro

In answer to the question 'How should yunity license non-code creations? (e.g. pictures, videos, articles, etc...)', 13 participants accepted the proposal 'CC0 for pictures and videos. The most permissive CC license available for the wiki.' on 2016-05-25. Advantages for the very permissive cc0 license (essentially public domain) include the ease for others (especially old media) to use our content, the increase in publicity this could bring, the message that we trust others and to manifest our stated interest in 'unconditional sharing'. In creating content for yunity, please do all you can to uphold this communal decision.

Agreement

Information from Wikipedia

en.wikipedia.org before saving a page

By clicking the "Save page" button, you agree to the Terms of Use and you irrevocably agree to release your contribution under the CC BY-SA 3.0 License and the GFDL with the understanding that a hyperlink or URL is sufficient for CC BY-SA 3.0 attribution.

longer text on de.wikipedia.de

Mit dem Speichern dieser Seite versicherst du, dass du den Beitrag selbst verfasst hast bzw. dass er keine fremden Rechte verletzt, und willigst ein, ihn unter derCreative Commons Attribution/Share-Alike Lizenz 3.0und der GNU-Lizenz für freie Dokumentation zu veröffentlichen. Falls du den Text nicht selbst verfasst hast, muss er unter den Nutzungsbedingungenverfügbar sein und du stimmst zu, notwendigen Lizenzanforderungen zu folgen. Du stimmst einer Autorennennung mindestens durch URL oder Verweis auf den Artikel zu. Wenn du nicht möchtest, dass dein Text weiterbearbeitet und weiterverbreitet wird, dann speichere ihn nicht.Bitte gib Belege für hinzugefügte Informationen an! Wikipedia-Artikel sollen nur überprüfbare Informationen aus zuverlässigen Publikationen enthalten.

What happens with those texts is, that the authors are the responsible party, not wikipedia.

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