If you would like to upgrade windows media player security component then you will need to delete/clear the DRM cache.
http://drmlicense.one.microsoft.com/Indivsite/en/indivit.asp?force=1
Here you can upgrade the security components of your windows media player to run protected files on your system.
http://drmlicense.one.microsoft.com/crlupdate/en/crlupdate.html
Here you can upgrade the security components of your windows media player to run protected files on your system acquired before upgrading to Windows Media Player 11.

