A public domain dedication. Use, modify, distribute, or sell this software however you want with no restrictions.
Permissive open source license. Free to use in any project, including proprietary software, with attribution required.
Weak copyleft for libraries. Can be used in proprietary software, but modifications to the library itself must remain open source.
Strong copyleft license. Derivative works must be released under the same license, ensuring software freedom is preserved.
Network copyleft license. Like KPL, but also requires source code disclosure for software accessed over a network (SaaS/cloud).
Copyleft license for documentation and written works. Derivatives must preserve freedom, ensuring knowledge remains open.
Permissive license for documentation and books. Free to use and modify with attribution, no copyleft requirement.
Copyleft license for visual and audio media. Ensures creative works and derivatives remain freely available.
Permissive license for images, video, and audio. Free to use and remix with attribution, no copyleft requirement.