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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.
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]
Permissive licenses allow for unrestricted use, modification, and distribution of a copyrighted work. The modified BSD license, the X11 license, and the MIT license are each examples of permissive licenses. These licenses seek to make it as easy as possible to reuse the licensed work: the objective is generally to make the work available and as ...
[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]
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]
Family quotes from famous people. 11. “In America, there are two classes of travel—first class and with children.” —Robert Benchley (July 1934) 12. “There is no such thing as fun for the ...
Get inspired by these Black History Month quotes from notable figures, activists and politicians including Rosa Parks, Martin Luther King Jr. and others. 45 inspiring quotes to read during Black ...
Sometimes the word "permissive" is considered too ambiguous, because all free software licenses are "permissive", in the sense that they all allow to modify and redistribute the source code. In most cases the real opposition is between copyleft licenses and non-copyleft ones, thus some authors prefer to use the term "non-copyleft" instead of ...