Re: GPL preamble removal
>Thanks for the response -- I hadn't noticed that phrasing before.
>But if I give *you* a copy of Sniffmacs under the Sniffen GPL,
>wouldn't you then be bound only to give others the SGPL, not the GGPL
>with its Preamble?
Now we get into a subtle point of copyright law. This is how I believe it
If work B is a derivative work of work A,
then to make a derivative work of work B (unless you carefully avoid all the
parts derived from work A), you need licenses granted by the copyright
holders of work B and work A.
If Sniffmacs is work B and GNU emacs is work A, then in order to make a
derivative of Sniffmacs, I need a license to work B (Sniffen GPL), which does
not require preamble inclusion. But I also need a license to work A, and the
license to work A specifies the inclusion of a copy of the GNU GPL.
The GPL grants "you", the recipient, a separate license for each particular
work. Term 6 is the term which propagates each individual license to the
recipients of all modified works.
Normally this sort of thing isn't an issue in free software. I only know
about it because I looked at one point into the issues of making a sequel to
a book which had characters used under license from two other books. (You
have to get separate licenses from all three authors.) IANAL, of course....