Cinavia code 3 refers to audio protection, which is activated by a special code found inside a Blu-ray disc. Cinavia is a watermark code that is used to protect against piracy, and is activated when the PlayStation 3 does not have the corresponding code required to play the disc.
Cinavia is often used to protect different types of media, such as professionally produced content or something that is supposed to be used solely with professional equipment. In order to play the protected media on other forms of projectors or consoles, the watermark code must be expunged from the Blu-ray disk. However, the PlayStation 3 system has a temporary fix, in which a user can push the date forward a year and override the Cinavia code.