Open Source & Derivative Works
WordPress & the GPL
ProCD v. Zeidenberg
USL v. BSDi
Shrink Wrap License
MS Community License
MS Permissive License
In copyright law, a derivative work is a copyrighted work which includes significant copyrighted aspects of a previously created work. It is worth noting that a work can be a derivative work of more than one previous work if it includes copyrighted elements of each of these previous works.
In United States law, "derivative work" is defined by is defined in 17 U.S.C. § 101:
Note: In contrast to copyleft licenses, most proprietary licenses typically do not allow the creation of derivative works at all, except with the explicit permission of the copyright-holder).
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