“Although the software isn’t itself malicious, the hiding techniques used are exactly the same that malicious software known as rootkits use to hide themselves. The DRM software will cause many similar false alarms with all AV software that detect rootkits.
The hiding techniques used by the DRM software can be abused by less technical malware authors to hide their backdoors and other tools. If a malware names its files beginning with the prefix ‘$sys$’, the files will also be hidden by the DRM software. Thus it is very inappropriate for commercial software to use these techniques.”
F-Secure via Juha
some links added
Good Noodles.