libpng License
| Author | Glenn Randers-Pehrson |
|---|---|
| Version | none |
| Publisher | Glenn Randers-Pehrson |
| Published | 2000 |
| DFSG compatible | Yes |
| FSF approved | Yes |
| OSI approved | Yes |
| GPL compatible | Yes |
| Copyleft | No |
| Linking from code with a different license | Yes |
The libpng license is a permissive free software license,[1] which defines the terms under which the libpng software library can be distributed.
[edit] Origin and history
The libpng license was derived in 1996 from the zlib license and has been referred to since by a variety of terms including at least the "zlib license" (even though it is different) and the "zlib/libpng license". Standards/free software bodies such as OSI currently refer to the license as the "zlib/libpng license". [2]
The license differs most significantly from the zlib license in including a clause for compatibility with the UCITA. This was added around 2000 in response to the adoption of UCITA by the US state of Maryland. [3] Since this was after the adoption of the license by OSI questions have been raised about the actual OSI status [4] [5]
[edit] External links
- The PNG file format home page [1]
- The libpng home page.
- The text of the license on the web page.
[edit] References
- ^ "libpng Copyright Notice, Disclaimer, and Licence". http://libpng.org/pub/png/src/libpng-LICENSE.txt.
- ^ png-mng-implement mail archives; message on license name history.
- ^ png-mng-implement mail archives; message about addition of the UCITA clause.
- ^ png-mng-implement mail archives; message on UCITA
- ^ png-mng-implement mail archives; subsequent message on UCITA
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