CPRM device keys was mounted on 2009-10-20. The attack was intended to find any of 3066 secret device keys by testing MKB from Panasonic LM-AF120LE DVD-RAM disc. On 2009-11-27 such key for column 0 and row 2630 was discovered. By now the CPPM/CPRM protection scheme is deemed unreliable. Notes References Broken block ciphers Feistel ciphers