 begin pgp signed message hash shaNUMBER hi i am wondering if there are any techniques to make a cd key of the like unbreakable either by giving it a cancelation date and a periodic renewal from a server or just by using self mdNUMBER signature on the resulting executable i know it must not be easy because the whole software piracy problem would be resolved but there must be some way to make it really hard to break it anyone have hints on this issue thanks yannick gingras network programer esc wq begin pgp signature version gnupg vNUMBER NUMBER NUMBER gnu linux comment for info see URL idNUMBERdbqeNUMBERbpyzuvNUMBERgNUMBERdnfo qraqbhakchtekxwdNUMBERzdmwf okakjxnnpknwacgtxzNUMBER vNUMBERbbabueNUMBERvx uyNUMBERfhnNUMBERifs uwqj end pgp signature 