The encryption and decryption algorithms are available for peer review, but implementations require the so-called "secret constant", the values of the substitution box (S-box), which are only available under a license from the 4C Entity.

In a practical experiment, the attack succeeded in recovering parts of the S-box in 15 hours of CPU time, using 2 plaintext-ciphertext pairs.

To enforce the broadcast flag, digital video recorders employ CPRM-compatible storage devices, which the project aimed to circumvent.

However, the project was ended and declared a failure on 2004-03-08 after searching the entire 56-bit keyspace, failing to turn up a valid key for unknown reasons.

The attack was intended to find any of 24570 secret device keys by testing MKB file from Queen "The Game" DVD-Audio disc.