luckyluke, please try the latest Media Center 17.
WMA with DRM files are playing for us, at least if they're playable in WMP.
Don't know if this helps, or adds to the confusion, but I have had some recent experience with this issue:
I am required to view DRM protected wmv files for a college course I am taking. The college gave me a user name and password.
If I try to view the file with MC 17.0147, it either freezes or just continuously pauses with the message: Acquiring DRM rights.
However, I have found that, if I first open the media with WMP, it will prompt me for user name and password. Once I input these, I can then close WMP and open the file in MC 17.014. Unfortunately, if I reboot or just wait a long time I have to repeat the process. WMP will not play the file either until the password is input again.
MRPRO
Just thought I would ad my experience....