Resource Page DescriptionOne of the things that a lot of DRM savvy CDNs are doing is to use WM Encoder to add WM DRM to their content without actually re-encoding. This is basically a copy operation from the input file (WMV) to an output file (WMV). The samples are never decompressed but rather passed directly through the Encoder. In the interim the Encoder can add WM DRM protection. This allows a very quick way to add WM DRM protection to a file without needing to re-encode, without any quality loss and without needing to protect the video on the server side with the WMRM SDK components. It’s a really a great way to get WM DRM protection enabled on the client.
This is some VB.net WinForms / ASP sample code that I wrote years ago to demonstrate how to use this technique. I haven’t tried running this code since it was first written so it might not work out of the box. However, it should give you a starting point to enable you to create your own solution.
For more information about this process and other issues you may encounter using this technique please visit the corresponding blog post.
http://blogs.msdn.com/mediasdkstuff/archive/2008/10/14/using-the-wm-encoder-to-protect-existing-content-with-wm-drm.aspx