Sony CDs banned in the workplace

I've been chasing down several accounts of government agencies, companies, educational institutions and others banning the use of Sony CDs on their PCs, due to the security risks of having Sony's rootkit DRM infecting their PCs. One government ministry, Alberta Agriculture, has banned the use of music CDs altogether, since Sony is hardly the only music company crippling its CDs with sneaky, malicious software. Here are a couple examples:

It has been brought to our attention that there is significant risk to the security and the operation of UC computers in using Sony BMG produced CDs. For this reason, the use of Sony BMG produced CDs in University of Canberra computers is prohibited.

Link to Alberta Agriculture letter Link to University of Canberra letter (Thanks, tipsters!)