An easy way to prove that you made it and own the rights is to make a master copy for yourself, put it in a disc mailer with a letter identifying it, put a code on the outside of it so you know what or which one it is, then mail it to yourself. When it is delivered, do not open it simply identify it by the code and put it in a file. It will come from you to you with a postmarked date on it...If you need to prove it's yours, open the mailer in court or follow what your attorney wants you to do. Writers do it that way all the time to prove their manuscripts are their property.
[