Open Source & Derivative Works
WordPress & the GPL
ProCD v. Zeidenberg
USL v. BSDi
Shrink Wrap License
MS Community License
MS Permissive License
Viral Licenses is a term used (often perjoratively) to refer to those FLOSS licenses which require not only a particular original work is distributed under a particular license, but also that modifications, additions and derivative works are also distributed under the same license as the original work.
The majority, if not all, licenses which might be described as viral are strong copyleft licenses. An example of one such license is the GPL, which (among other things) requires that derivative works of GPL-licensed works are also distributed under the GPL.
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