Copyright and Licensing for Contributions

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Please note


Preamble

Important

Please note that this information only reflects the opinions and guesses of me Martin "arand" Werner.

This information is not written by a lawyer and is not legal advice.

Terminology

  • "Data" here refers to game assets, for example maps, music, textures, etc.
  • As a general rule Red Eclipse itself uses the CC-BY-SA-3.0+ license for data and the Zlib license for code

If you contribute data to Red Eclipse

Your own original contribution not based on someone else's work

You are required (in order for your contribution to be accepted) to:

  • Pick an "open-source friendly" license without non-commercial restrictions for the work
    • Don't use GPL licenses unless it has a "font-exception" clause or similarGPL
    • Don't use public-domain unless it's explicitly CC-0PD

You are encouraged to:

  • Keep your individual copyright for the work
  • Use CC-BY-SA-3.0+ or CC-BY-3.0+CC+ as the license (or something else if you have a personal preference)
  • Use your real name and email to identify authorship

If you really want to:

  • You may contribute your work to Red Eclipse with the understanding that your copyright will be instead assigned to the Red Eclipse TeamRE-team and will be licensed by the Red Eclipse Team as CC-BY-SA-3.0+CC+

Examples

CC-BY-SA-3.0+
This work, "Foo", is created by John "jdoom" Doe <jdoom@isp.com>

It is Copyright (C) 2012-2013 John "jdoom" Doe <jdoom@isp.com>

It is licensed under the Creative Commons Attribution ShareAlike (CC-BY-SA)
Unported License, either version 3.0 or (at your option) any later version.

To view a copy of this license, read "cc-by-sa.txt" or visit
<http://creativecommons.org/licenses/by-sa/3.0/>
CC-BY-3.0+
This work, "Foo", is created by John "jdoom" Doe <jdoom@isp.com>

It is Copyright (C) 2012-2013 John "jdoom" Doe <jdoom@isp.com>

It is licensed under the Creative Commons Attribution (CC-BY)
Unported License, either version 3.0 or (at your option) any later version.

To view a copy of this license, visit
<http://creativecommons.org/licenses/by/3.0/>

Contribution based on someone else's work

You are required to:

  • Maintain the original author's copyright notices/credits and license information
  • Making sure that this original license is an "open-source friendly" license without non-commercial restrictions (ask if you are unsure)
  • If you base your work on many works, make sure that the licenses of each work is compatiblecompatible
    • Don't use or base on GPL licenses unless it has a "font-exception" clause or similarGPL
    • Don't use or base on public-domain unless it's explicitly CC-0, or unless the copyright of the original work has expiredPD

You are encouraged to:

  • Add your copyright and license for your individual modifications on top of the original author's copyright and license for the work
  • Use the same license as that of the original work
  • Use your and the original author(s)'s real name(s) and email(s) to identify authorship

If you really want to:

  • You may contribute your work to Red Eclipse with the understanding that the that your copyright for your modification will be instead assigned to the Red Eclipse TeamRE-team and will be licensed by the Red Eclipse Team as CC-BY-SA-3.0+CC+

Examples

Based on a CC-BY-SA-3.0 work
This work, "Foo", is created by John "jdoom" Doe <jdoom@isp.com>
It is based on a work "Bar" created by Alice "asmi" Smith <asmi@isp.com>

It is Copyright (C) 2010-2012 Alice "asmi" Smith <asmi@isp.com>
and Copyright (C) 2012-2013 John "jdoom" Doe <email@isp.com>

It is licensed under the Creative Commons Attribution ShareAlike (CC-BY-SA)
Unported License version 3.0.

To view a copy of this license, read "cc-by-sa.txt" or visit
<http://creativecommons.org/licenses/by-sa/3.0/>
Based on MIT (Expat) work
This work, "Foo", is created by John "jdoom" Doe <jdoom@isp.com>
It is based on a work "Bar" created by Alice "asmi" Smith <asmi@isp.com>

It is Copyright (C) 2010-2012 Alice "asmi" Smith <asmi@isp.com>
and Copyright (C) 2012-2013 John "jdoom" Doe <email@isp.com>

It is licensed under the MIT (Expat) License.

To view a copy of this license, visit <http://opensource.org/licenses/MIT>
Based on both a CC-BY-SA-3.0 and a MIT (Expat) work

Note that the combined work will be licensed under the CC-BY-SA-3.0 license, this being the least permissive of the two.

This work, "Foo", is created by John "jdoom" Doe <jdoom@isp.com>
It is based on a work "Bar" created by Alice "asmi" Smith <asmi@isp.com>
and on a work "Baz" created by Eve "ela" Langton <ela@isp.com>

This combined work is Copyright (C) 2003 Eve "ela" Langton <ela@isp.com>
and Copyright (C) 2010-2012 Alice "asmi" Smith <asmi@isp.com>
and Copyright (C) 2012-2013 John "jdoom" Doe <email@isp.com>

It is licensed under the Creative Commons Attribution ShareAlike (CC-BY-SA)
Unported License version 3.0.

To view a copy of this license, read "cc-by-sa.txt" or visit
<http://creativecommons.org/licenses/by-sa/3.0/>

If you contribute code to Red Eclipse

Small changes to the code (for example patches)

  • Your copyright for the code will be assigned to Quinton "quin" Reeves and Lee "eihrul" Salzman

Large changes to the code

You are required to:

  • Use the Zlib license (or a compatible license) for the code

If you want to:

  • You may assign your copyright for the code to Quinton "quin" Reeves and Lee "eihrul" Salzman

Notes

  1. Note GPL: The GPL and the CC-BY-SA-3.0 are incompatible licenses, that means that a combined work from data using both licenses (for example a screenshot) might be undistributable, we want to avoid this. If the GPL license has a "Font Exception" clause or similar, this should not be a problem.
  2. Note CC-old: The CC licenses prior to 3.0 are unclear on some key points, and may not be very good licenses because of this, see for example this summary for more information, note that if your work is an Adaptation of a work based on versions prior to 3.0 you can upgrade the license to version 3.0 and it works out ok.
  3. Note RE-team: Copyright assignment to the Red Eclipse team is the case for a lot of the contributions by the regular developers of Red Eclipse, which also are a part of the Red Eclipse Team, so the copyright is shared. The Red Eclipse Team is not a well defined group, other than Quinton "quin" Reeves and Lee "eihrul" Salzman being the Team Lead.
  4. Note CC+: The plus (+) here meaning version 3.0 or later.
  5. Note compatible: For MIT (Expat), Zlib, CC-BY-3.0, and CC-BY-SA-3.0 this is normally fairly straightforward; the resulting license for a combined work will be the rightmost one in that order (i.e. the most restrictive). For anything more advanced, do some reading and/or ask around.
  6. Note PD: Public Domain is not a license, modern use of "Public Domain" is often considered unclear, depending on whom you ask. See http://wiki.creativecommons.org/Public_domain for more information. CC-0 (or similar all-permissive licenses) is normally the best way to do the conceptual equivalent of "Public Domain".