i'm doing some work for some people who want me to sign the
normal non-disclosure and invention assignment agreement. 
however, some of the work will be free s/w related (gcc related), and i
want to make sure that anything i end up doing for them will be able 
to funneled back into the free s/w morass. Since most of the stuff to be
done will not directly be disclosing any trade secrets, i don't see the
problem with this. But i'm looking for a good paragraph of legalese
which someone else may have already put forth to do this. The few
attempts i have tried have not fared well.  Any ideas? 

thanks
tim