android DRM problem

I am an android developer and I am developing now an android application that can download and read epub files with drm.

I am now struggling to understand how this drm works and I got messages from the RMSDK such as "No device provider implementation" ...

Has anybody came through this? Can anybody explai开发者_开发知识库n to me how to work with the DRM on an android system?

Thank in advance

Starting looking around for a good and reliable DRM client for Android:

https://play.google.com/store/search?q=+DRM+Client+for+Android&c=apps

and after that, download the documentation the DRM on how to encode/encrypt your content with the DRM software.

For a good explanation of the principles behind DRM:

http://wiki.mobileread.com/wiki/DRM

http://en.wikipedia.org/wiki/Digital_rights_management

For a specific DRM implementation I like this diagram (non-Android related):

http://i.msdn.microsoft.com/dynimg/IC498598.png

and its writeup here:

http://msdn.microsoft.com/en-us/library/cc189079(v=vs.95).aspx

The details may differ among the different DRM software though.