On Sun, 2008-06-29 at 12:39 -0400, Matthew Saltzman wrote:
The GPL is not the only license that protects code released under it
from incorporation into proprietary products. But some clauses in the
GPL prevent interoperability with other software that (for whatever
reason) was released under different licenses that even the FSF
acknowledges are in the spirit of freedom and open source. That's too
bad for free and open-source software.
Copyleft licenses are by nature incompatible with a number of other
licenses, and it's not because they are 'veil', a brief thinking about
the reasons for strong copyleft will make it evident why some licenses
are incompatible with others.