An anonymous reader quotes a report from Ars Technica: Unless something changes, an issue lurking in older PlayStations' internal timing systems threatens to eventually make every PS4 game and all downloaded PS3 games unplayable on current hardware. Right now, it's not a matter of if but when this problem will occur. [...] The root of the coming issue has to do with the CMOS battery inside every PS3 and PS4, which the systems use to keep track of the current time (even when they're unplugged). If that battery dies or is removed for any reason, it raises an internal flag in the system's firmware indicating the clock may be out of sync with reality. After that flag is raised, the system in question has to check in with PSN the next time it needs to confirm the correct time. On the PS3, this online check happens when you play a game downloaded from the PlayStation Store. On the PS4, this also happens when you try to play retail games installed from a disc. This check has to be performed at least once even if the CMOS battery is replaced with a fresh one so the system can reconfirm clock consistency.
Why does the PlayStation firmware care so much about having the correct time? On the PS3, the timer check is used to enforce any "time limits" that might have been placed on your digital purchase (as confirmed by the error message: "This content has a time limit. To perform this operation go to settings date and time settings set via internet"). That check seems to be required even for downloads that don't have any actual set expiration date, adding a de facto one-time online check-in requirement for systems after their internal batteries fail. On the PS4, though, the timing check is apparently intended to make sure PSN trophy data is registered accurately and to prevent players from pretending to get trophies earlier than they actually had. You'd think this check could be segregated from the ability to load the non-trophy portions of the game, but player testing has shown that this seems to be a requirement to get PS4 games to load at all. Last month, Sony shut down PlayStation Store access for the PlayStation 3, PlayStation Vita, and PlayStation Portable. Sony will eventually shut off the PSN servers that power the timing check for hardware it no longer considers important. "After that, it's only a matter of time before failing CMOS batteries slowly reduce all PS3 and PS4 hardware to semi-functional curios," adds Ars.
Sony could release a firmware update that limits the system functions tied to this timing check, but Sony hasn't publicly indicated it has any such plans.
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