Counterfeiting of optical disc drives used with game systems is prevented by storing an obfuscated authentication key in firmware of the disc drive. Each disc drive can implement a different obfuscation scheme. The authentication key is parsed into components and the components are stored in various...http://www.google.com.au/patents/US8181039?utm_source=gb-gplus-sharePatent US8181039 - Disc drive counterfeiting countermeasure
