If you do a lot of spy work or work in a highly secretive environment, then you need to keep a lot of info under wraps so that no one gets the wind of it. Aiding you on you mission to data secured is this new self-destructive DVD by a German company. Called the Einmal (German for once), the disk is coated with a special chemical and can only be watched for 48 hours. There doesn't seem to be a DRM method on these discs. However be sure to leave no backups on other normal disks.
The Einmal costs about ˆ3.99 ($6.44) a disc.
Source
http://www.newlaunches.com/archives/selfdestructing_dvds.php