APARSEN has released the Report on DRM Preservation.
Here's an excerpt:
This report places the subject of Digital Rights and Access Management (DRM) within the context of long-term digital preservation and examines the related risks and challenges which arise in connection with the long-term archiving and ongoing accessibility of DRM-protected objects, and also the safeguarding of associated rights. It reviews the results of initiatives and projects already undertaken in this field and provides the results of a recent survey. It also analyses current user scenarios both within and outside the APARSEN consortium before offering a summary of recommendations and best practices for dealing with digital rights and DRM protected objects.