There would already be some deals signed for silent hills though (not saying full exclusivity but there was most likely a marketing deal, otherwise PT would've released on xbone as well). It's no accident that PT was only on ps4. Simply selling the ip does not invalidate any existing deals. The only real way around it would be to change the name of the game. Edit: also, this is just rumour. http://bloody-disgusting.com/news/3347051/rumor-silent-hills-purchased-microsoft-xbox-one-exclusive/