So while reviewing the Ohio Revised Code of law to see if I can drive with a foot cast on, I found that there are laws governing castings and a caster's rights... http://codes.ohio.gov/orc/1333.31
(1) A molder has a lien on a die, mold, pattern, or form that is in his possession and that belongs to a customer, for the following: So basically you have rights when someone gives you a mold to cast, over the mold.