PSP and PS3 owners, listen up. Sony has just announced a new rule change, effective two weeks from now, which will see future games bought from the PlayStation Network limited to being activated on only two devices at a time. That's down from the current limit of five, but Sony will try to make the whole thing as painless as possible with the introduction of an online account manager that'll let you deactivate devices remotely. The change — affecting content on the PlayStation 3 and the full PSP range, PSP Go included — will not have retroactive effect, meaning that games bought before the 18th will continue to be accessible on as many gaming machines as they are now.