BD +: Denotes a very efficient Copy protection for Blu-Ray disks It was added to the existing one in mid-2007 AACS introduced. Based on a Java Virtual Machine, the copy protection checks in the background after inserting a disc whether the output of the film has been manipulated. The virtual machine is able, for example, to use programs stored on the disc to check whether unauthorized attempts are being made to read the disc or whether the player has been modified. If such an irregularity occurs, the playback process is immediately interrupted.
