slight OT...A number of points:
1) lower the profit margin for professional private. If you price your stuff at $500 where as the real cost of producing it is $2. Those people with sufficient means will sure want to get in(ie. pirates) your stuff to have a cut at the margin.
2) produce/make stuff that are worthwhile; so that people really see the value with the 'real' stuff.

Implementation of DRM does not address the two points above, so the chance of it being successful to at the official intended purpose(stopping the the private) is next to nil. However, for the rest of the people(ie. people without means to overcover DRM), you will be forever paying to the content producer at each and every refresh of content delivery-medium