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  2. Comparison of free and open-source software licenses

    en.wikipedia.org/wiki/Comparison_of_free_and...

    The OSI recommends a mix of permissive and copyleft licenses, the Apache License 2.0, 2- & 3-clause BSD license, GPL, LGPL, MIT license, MPL 2.0, CDDL and EPL. License and version FSF approval

  3. Permissive software license - Wikipedia

    en.wikipedia.org/wiki/Permissive_software_license

    A permissive software license, sometimes also called BSD-like or BSD-style license, [1] is a free-software license which instead of copyleft protections, carries only minimal restrictions on how the software can be used, modified, and redistributed, usually including a warranty disclaimer.

  4. License compatibility - Wikipedia

    en.wikipedia.org/wiki/License_compatibility

    License compatibility is a legal framework that allows for pieces of software with different software licenses to be distributed together. The need for such a framework arises because the different licenses can contain contradictory requirements, rendering it impossible to legally combine source code from separately-licensed software in order to create and publish a new program.

  5. Copyleft - Wikipedia

    en.wikipedia.org/wiki/Copyleft

    The strength of the copyleft license governing a work is determined by the extent to which its provisions can be imposed on all kinds of derivative works. Thus, the term "weak copyleft" refers to licenses where not all derivative works inherit the copyleft license; whether a derivative work inherits or not often depends on how it was derived.

  6. Open-source license - Wikipedia

    en.wikipedia.org/wiki/Open-source_license

    The Copyleft sticker from an envelope Don Hopkins mailed to Richard Stallman in 1984. Copyleft licenses require source code to be distributed with software and require the source code to be made available under a similar license. [34] [60] Like the permissive licenses, most copyleft licenses require attribution. [61]

  7. Software license - Wikipedia

    en.wikipedia.org/wiki/Software_license

    The most popular open source licenses as of 2022 are the Apache License (permissive), the MIT License (permissive), and the GPL (copyleft). If software is in the public domain, the owner's copyright has been extinguished and anyone may use the work with no copyright restrictions. [1]

  8. Free license - Wikipedia

    en.wikipedia.org/wiki/Free_license

    [15] [16] Permissive licenses come from academia. [17] Copyleft licenses come from the free software movement. [18] Copyleft licenses require derivative works to be distributed with the source code and under a similar license. [15] [16] Since the mid-2000s, courts in multiple countries have upheld the terms of both types of license. [19]

  9. Free-software license - Wikipedia

    en.wikipedia.org/wiki/Free-software_license

    The Free Software Foundation prefers copyleft (share-alike) free-software licensing rather than permissive free-software licensing for most purposes. Its list distinguishes between free-software licenses that are compatible or incompatible with the FSF's copyleft GNU General Public License .