> If I submit a patch to the GCC project---necessitating an assignment > of the copyright to the FSF---then can the people of the FSF decide > that they don't want me to distribute my own work in another project > (proprietary or otherwise)?
No, because the assignment agreement says that the FSF "agrees to grant the Assigner non-exclusive rights to use the Work (i.e. the changes and enhancements, not the program which was enhanced) as it sees fit". And, indeed, this is commonly done. For example, Cygwin had two different license agreements, one when it's distributed by the FSF and one when it's purchased by Cygnus.
