Yes, I know what multisession is. The trick is that there is no trick. Imagine that there is a trick that allows you to univocally identify an original CD, right? Then, music companies (at least the big ones) would have succeeded in their antipiracy crusade. But they hadn't, why? Simple: There is no way for a machine to recognize a 1:1 copy of a CD no matter the CD Copy protection implemented on it. The only way a machine would recognize that a CD is a copy, is to have eyes and see the disc's label on it. Sorry!
PS: What is the final idea of the software anyway? Do you work for a Music/Film company?
Sebastián - Argentina