Everything about Permissive Free Software Licences totally explained
Permissive free software licences are
free software licences for a
copyrighted work that offer many of the same freedoms as releasing a work to the
public domain. In contrast,
copyleft licences like the
GNU General Public License require copies and derivatives of the source code to be made available on terms no more restrictive than those of the original licence.
Well-known examples of permissive licences include the
MIT License and the
BSD licenses.
Comparison to public domain
Computer Associates Int'l v. Altai used the term "public domain" to refer to works that have become widely shared and distributed under permission, rather than work that was deliberately put into the public domain. However, such licences are not actually equivalent to releasing a work into the
public domain, so such a term can be considered a
misnomer.
GPL compatibility
Some permissive free software licences contain clauses that require advertising materials to credit the copyright holder. Licences with an advertising clause include the
4-clause BSD license, the
PHP License, and the
OpenSSL Licence. These licences, although they're permissive free software licences, are incompatible with the
GNU General Public License.
Examples of permissive free software licences
without advertising clauses are the
MIT License, the 3-clause
BSD license, the
Zlib License, and all versions of the
Apache License except 1.0.
Further Information
Get more info on 'Permissive Free Software Licences'.
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