which agreement ??

[DavidG]

I use a sample that says :

" MODEL RELEASE. The CLIENT hereby grants to x and successors, heirs, executors, administrators, assigns, attorneys, representatives and agents, the irrevocable and unrestricted right to use and publish photographs of the CLIENT or in which the CLIENT may be included, for editorial, trade, advertising or any other purpose and in any manner or medium; to alter the same without restriction; and to copyright the same.
"
if that helps at all

So that bascially allows me to do as I please ??

What does " to alter the same without restriction; and to copyright the same " mean ??