1.DRM or IRM (Information Rights Management) adds an extra layer of access controls on top of the data object or document and provides granularity flowing down to printing,saving,copying and other options.
2.ACLs are embedded into the file,it is agnostic to the location of data.IRM will travel with the file (persistent)
3.Dynamic policy control allows the owner to define and change user permissions and recall or expire content even after distribution