The original PS2 cannot use pirated software, and DVD-Video is also restricted by area code. Only when the so-called "chip" (integrated circuit) is installed can the machine "admit piracy" and read pirated data, which is called direct reading. The chip is installed inside the machine, and different models of hosts correspond to many products of different manufacturers and models, such as Apple chip, X2 chip, NH and many other genuine brands (some brands are well-known European and American brand products "cloned" by Hong Kong and Taiwan).

To put it more popularly, it is a technical means product to crack the game coding or encryption.

The encryption method used in the game is not a password form, but a double-key technology. This is completely different from the encryption method we usually use for files. Its encryption password and decompression password are different. In this encryption system, each group of passwords has a public key that everyone knows and a private key that only the manufacturer or the user keeps. The real secret is the algorithm that produces both. Data encrypted with public key can only be decompressed with private key, which is what we call encryption. Private key encryption does not really encrypt data, it just generates an identification of this disk, and it can be determined whether this disk is encrypted with the corresponding private key by using the public key. This is authentication, which means digital signature. In this case, the data is not really encrypted.

The password of the boot area of the ps2 disk is the public key of the disk, and the encryption is carried out by the manufacturer with the private key during production (there are infinite kinds of private keys, but people without the original algorithm can't forge the private key), that is to say, in fact, the host only recognizes whether the disk is made by Sony, and the data on the disk is not really encrypted, so our optical drive can also read the data of the genuine ps2 disk. In this case, Sony actually relies on manufacturer D to produce a disk with a boot area, rather than any encryption.