Maybe I am thick - but I cannot see how you can stop a CD being played on a CD drive, if it will also play on a bog-standard domestic CD player. Surely whatever magic code is on the CD, and ignored by the domestic CD player, can be ignored also by the CD-rom drive ? Tim -- Gllug mailing list - Gllug at linux.co.uk http://list.ftech.net/mailman/listinfo/gllug