The hacker community has found a way to make the Vita run unsigned code by exploiting weaknesses in PSP games available for download in the PSN store. In response, Sony has made the affected games unavailable for download for all platforms — PSP and Vita both — even if you had already paid for it and hadn't had the chance to download it yet. In the case of 'Everybody's Tennis', the game was removed from the PSN worldwide after the modder community bragged about the game being exploitable but before any exploit was released for it. Is Sony being too overzealous in its fight against piracy?"

http://games.slashdot.org/story/12/0...o-vita-hackers