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Dennis E. Hamilton wrote:
If I am the copyright holder of my code, I can issue it with a license
that requires anyone who modifies my source code to provide me with
the changes to my code that they make.  ...
PS: It is the case that neither the GPL nor APLv2 have such a
compulsory condition and it would be interesting to see what the FSF
would say in the event someone sublicensed a GPL derivative in that

Adding to what Greg already wrote (i.e., you need that a distribution of
the software happens in order to enforce this), this requirement is
considered compatible with Free Software licenses. See (search for "previous
developer" or read the last line about revision 1.11).

But it is not possible to attach it to existing LGPL3/GPL3 code since it
would violate section 10 of GPL3:


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