Skip to content

CLA.md

Latest commit

 

History

History
129 lines (93 loc) · 5.4 KB

CLA.md

File metadata and controls

129 lines (93 loc) · 5.4 KB
Raw

Twig Contributor License Agreement

Why this exists (read this first)

Twig is licensed under GPL-3.0-only. That license was not entirely a free choice: two of its dependencies — the Termux terminal emulator and the Jellyfin FFmpeg decoder — are GPLv3, and linking them makes the whole application GPLv3.

Keeping the ability to license the project's own code differently matters for concrete reasons:

  • The copyleft is inherited, not chosen. If those dependencies are ever replaced — the terminal with an Apache-2.0 implementation, the decoder with a self-built LGPL FFmpeg build — the project's own code could move to a more permissive license. That option only exists if the whole codebase can be relicensed.
  • Some distribution channels impose terms that conflict with the GPL. Where that happens, the usual remedy is to grant separate terms for that particular build, which requires holding all copyright in the code being shipped.
  • License problems need room to be fixed. Adding an exception, moving to a weaker copyleft license (as VideoLAN did for VLC), or dual-licensing all require the same thing: one party able to speak for the whole codebase.

None of this is possible if parts of the codebase are owned by contributors who only ever granted GPL rights. Contacting every past contributor after the fact is usually not feasible, so the grant has to be in place from the start.

What this CLA does not do: it does not take your copyright away, it does not make Twig any less free, and it does not let anyone un-free a release that has already shipped. Every version published under GPL-3.0 stays under GPL-3.0 forever — that is irrevocable, and nothing here changes it.

Agreement

By submitting a Contribution to the Twig project ("the Project"), You agree to the following terms.

1. Definitions

  • "You" means the individual or legal entity submitting a Contribution.
  • "Contribution" means any work of authorship You intentionally submit to the Project — including code, documentation, tests, configuration and translations — through a pull request, patch, issue attachment, or any other means.
  • "Owner" means vale, the original author and maintainer of the Project, and any successor to whom the Project's rights are lawfully transferred.

2. Copyright

You retain full ownership of the copyright in Your Contribution. This agreement is a license, not an assignment. You remain free to use, publish and license Your Contribution elsewhere on any terms You choose.

3. Copyright license grant

You grant to the Owner a perpetual, worldwide, non-exclusive, royalty-free, irrevocable license to reproduce, prepare derivative works of, publicly display, publicly perform, sublicense and distribute Your Contribution and such derivative works, under any license terms the Owner selects, including copyleft, permissive and proprietary terms.

You also grant the same rights to every recipient of the Project under the license the Project is distributed with (currently GPL-3.0-only).

4. Patent license grant

You grant to the Owner and to recipients of the Project a perpetual, worldwide, non-exclusive, royalty-free, irrevocable (except as stated below) patent license to make, have made, use, offer to sell, sell, import and otherwise transfer Your Contribution. This license applies only to those patent claims licensable by You that are necessarily infringed by Your Contribution alone, or by the combination of Your Contribution with the Project.

If any entity institutes patent litigation alleging that Your Contribution, or the Project to which You contributed, constitutes direct or contributory patent infringement, then any patent licenses granted to that entity under this agreement terminate as of the date such litigation is filed.

5. Your representations

You represent that:

  1. Each Contribution is Your original creation, or You have the right to submit it under the terms of this agreement;
  2. If Your Contribution includes work that is not Your original creation, You have identified its source and its license, and any restrictions that apply;
  3. If Your employer has rights to intellectual property You create, You have received permission to make the Contribution on behalf of that employer, or Your employer has waived such rights;
  4. You are legally entitled to grant the licenses above.

6. No warranty, no obligation

Your Contribution is provided "AS IS", without warranties or conditions of any kind, express or implied. You are not expected to provide support for Your Contribution.

The Owner is under no obligation to accept, merge or use any Contribution.

7. Notice of changed circumstances

You agree to notify the Owner if You become aware of any facts that would make the representations in section 5 inaccurate.

How to sign

No paperwork, no external service. Either of the following counts as agreement:

Option A — one line in your pull request description:

I have read the CLA (CLA.md) and I agree to its terms.

Option B — sign off your commits:

git commit -s

which appends Signed-off-by: Your Name <your@email> to the commit message. By signing off you state that you agree to both the Developer Certificate of Origin and this CLA.

For trivial contributions — a typo fix, a one-line correction — the maintainer may waive this requirement at their discretion.