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2. BSD Licenses
In the late 1970s, a group of computer scientists and graduate students at the University of California–Berkeley created the Berkeley Software Distribution (“BSD”), a small collection of software tools they had written for the Unix operating system. Over time, BSD expanded to become a full-fledged Unix-compatible operating system in its own right. BSD was issued under the BSD License, which lent its name to a family of software licenses collectively known today as “BSD-style” licenses.

BSD-style licenses are models of brevity compared with the GPL. They mandate an express copyright notice acknowledging the owner and year of the work and authorize “[r]edistribution and use” of the licensed software “in source and binary forms, with or without modification[.]” This authorization is subject to only three conditions:
 * for software works distributed in the form of source code, the distribution must include the copyright notice, the listing of conditions from the license template, and a paragraph disclaiming warranties or liability based in contract or tort;
 * for software works distributed in the form of object code, those same items must be included in the accompanying documentation; and
 * for either type of work, the name of the owner’s organization or its contributors may not be employed in a manner that suggests endorsement or promotion of products derived from the licensed software.