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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
Copyleft is a type of free license that mandates derivative works to be licensed. The other types of free license lack this requirement: for permissive licenses, attribution is typically the only requirement, and public-domain-equivalent licenses have no restrictions.
The copyleft symbol is a mirrored version of the copyright symbol, ©: a reversed C in a circle. [60] A 2016 proposal to add the symbol to a future version of Unicode was accepted by the Unicode Technical Committee. [61] [62] The code point U+1F12F COPYLEFT SYMBOL was added in Unicode 11. [62] [63] The copyleft symbol has no legal status. [64]
Five Nights at Freddy's 2 (FNaF 2) is a 2014 point-and-click survival horror game developed and published by Scott Cawthon. It is the second installment in the Five Nights at Freddy's series. Set in a fictional pizzeria, the player takes on the role of night security guards Jeremy Fitzgerald and Fritz Smith, defending themselves from the ...
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 .
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]
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.
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.