License
FreeBSD is released under a variety of open source licenses. The kernel code and most newly created code is released under the two-clause BSD license which allows everyone to use and redistribute FreeBSD as they wish. There are parts released under three- and four-clause BSD licenses, as well as Beerware license. Some device drivers include a binary blob, such as the Atheros HAL of FreeBSD versions before 7.2. Some of the code contributed by other projects is licensed under GPL, LGPL, ISC or CDDL. All the code licensed under GPL and CDDL is clearly separated from the code under liberal licenses, to make it easy for users such as embedded device manufacturers to use only permissive free software licenses. ClangBSD aims to replace some GPL dependencies in the FreeBSD base system by replacing the GNU compiler collection with the BSD-licenced LLVM/Clang compiler. ClangBSD became self-hosting on 16 April 2010, an important landmark for further independent development.
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“My attitude toward punctuation is that it ought to be as conventional as possible. The game of golf would lose a good deal if croquet mallets and billiard cues were allowed on the putting green. You ought to be able to show that you can do it a good deal better than anyone else with the regular tools before you have a license to bring in your own improvements.”
—Ernest Hemingway (1899–1961)