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It depends on how that term is defined. Source for Unix Pine is provided to allow users and system administrators to customize and adapt Pine for their own requirements. UW's Pine license allows anyone to download source code for Unix Pine and make modifications for their own local use without asking permission. Anyone can also create and distribute patch files to implement bug fixes or minor enhancements without asking permission. However, redistribution of a modified version of Pine requires explicit permission from the University of Washington.
No. License wording has changed from time to time, but the owner's intent has not. When it was discovered that some individuals were misinterpreting the intent of the University, the license wording was clarified.
In particular, the earliest Pine licenses included the words: "Permission to use, copy, modify, and distribute this software... is hereby granted," but some people tried to pervert the meaning of that sentence to define "this software" to include derivative works of "this software". The intent has always been that you can re-distribute the UW distribution, but if you modify it, you have created a derivative work and must ask permission to redistribute it. There has never been implicit or explicit permission given to redistribute modified or derivative versions without permission. The license wording was therefore changed to clarify this point.
Yes. Distribution of patch files "to accomplish bug fixes, minor enhancements, or adaptation to new operating systems" are permitted and encouraged. (For more extensive changes, check with the UW.)
No; currently a less restrictive license is used for those libraries. See the University of Washington's Free Fork License on the IMAP Information Center Web site.
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