Windows Media Rights Manager provides a way for you to secure your content before distributing it to internet service providers through use of Windows Media Packager. When you are creating ASF content, if you wish to implement DRM on your .asf file you have two options:
Packaging a file does several different things:
Once a file has been packaged, it can not be modified by the Windows Media Tools. Properties of the file are set and protected from modification. Therefore, if you have a piece of content that you may want to modify later, it is best to create the file with Windows Media Tools first, save a back up copy, and then create the packaged file.