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Licenses we index

CC0 Discovery indexes content that is genuinely free to reuse, in three flavors. Code uses 0BSD; everything else uses CC0 or the Public Domain Mark.

CC0 1.0 Universal

The most permissive license: no rights reserved. You can use, modify, redistribute, and commercialize the work. Good for art, assets, images, audio, texts, and even code.

Learn more: creativecommons.org/publicdomain/zero/1.0/

Public Domain Mark

A tag for works that are already in the public domain (no copyright at all). Not a license you apply — it labels something that was never or no longer is protected.

Learn more: creativecommons.org/publicdomain/mark/1.0/

0BSD — Zero-Clause BSD (for code)

The simplest possible license for software: "Permission to use, copy, modify, and/or distribute this software for any purpose with or without fee is hereby granted." No attribution required, no conditions.

Learn more: opensource.org/license/0bsd

What we DON'T index

License	Why
CC-BY	Requires attribution — not freely reusable for everyone.
CC-BY-SA	Share-alike — derivative works must use the same license.
CC-BY-NC	Non-commercial — limits how it can be used.
All-rights-reserved	Copyright protected — no reuse.
Unclear / mixed	Ambiguous signals are rejected to avoid mistakes.