To open the DDK doors use the "H" disks, then to find the DDK passwork simply take away the key letters from the code letters. For example if the code is HBCEFAGDI and the key is BCFGI take BCFGI away fom HBCEFAGDI to get the password HEAD. WARNING: Watch out in this room, there is a T-Rex waiting for you when you leave!

Also, the D.D.K lock downstairs is "NEWCOMER" for the password. You have to have both "N" disks when you do this.