The PS3 uses this RAP file to verify that you actually own the game. Without the correct RAP file installed in the system's license directory, the PS3 will treat the game as unauthorized software and refuse to launch it.
Occasionally, legitimate users face issues where the PlayStation Network server verifies a purchase, but the local license file on the console becomes corrupted or is missing. This results in a "Copyright protection information is invalid" error or the game simply failing to start. In rare cases, restoring licenses via the PS3 account management menu fixes this, but sometimes the specific RAP file needs to be re-registered to the console's ID. Gta San Andreas Ps3 Rap File