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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.
Permissive licenses can be used within copyleft works, but copyleft material cannot be released under a permissive license. Some weak copyleft licenses can be used under the GPL and are said to be GPL-compatible. GPL software can only be used under the GPL or AGPL. [62]
[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]
It is unique among the OSI's licenses because of the choices it allows in its construction. It lets the licensor pick anywhere from 0-2 warranty disclaimers, whether they want to prohibit the author's name from being used in publicity or advertising surrounding a distribution (like in the BSD License), and other spelling and grammar options.
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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.
For instance, copyleft licenses impose a duty on licensees to share their modifications to the work with the user or copy owner under some circumstances. No such duty would apply had the software in question been in the public domain.
FOSS stands for "Free and Open Source Software". There is no one universally agreed-upon definition of FOSS software and various groups maintain approved lists of licenses. . The Open Source Initiative (OSI) is one such organization keeping a list of open-source licenses.