Open Source and Derivative Works
Open Source & Derivative Works
WordPress & the GPL
ProCD v. Zeidenberg
USL v. BSDi
Shrink Wrap License
MS Community License
MS Permissive License
Open Source & Derivative Works
Most proprietary licenses do not allow you to create programs by modifying somebody else's program/software, let alone distribute such programs.
In contrast however, open source licenses generally do allow you to create programs based on somebody else's code (such programs are known as "derivative works"), but may place restrictions on the terms under which you distribute any such derivative works.
Here is a video discussing these issues with particular reference to the BSD License, GPL License, and LGPL License.
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