Using software / encryption to turn information "objects" (files) into property.

CoryDoctorow against : http://www.commonhouse.net/wiki/drm/DRM20systems20are20bad20for_20artists

An example, seems to come from an educational perspective :

Why that's probably bad :

And talks about MyBank supports digital supply chains where you buy what you need it when you use it.

So see also : SoftwareSupplyChain

MicroSoft's is WMA (OnMicrosoft/PlatformWars)