can't you get the release forms from ss? if i am not mistaken they do supply them to us .
the things is, most sites accept generic forms, but sometimes the wording of one may not be usable with another, eg. i once used an IS form for ss,ft, dt,.. a long while back, and overlooked that
words Istock was on the release forms.
i later just took a generic release form and used it for all.
can't remember where i got them, perharps you can pm sean.