[vacri]

Copy protection is a form of DRM. It is used to manage rights to digital content. You're redefining DRM to mean "the trend of selling licenses rather than software", which is only one form of DRM.

[castell]

It's the other way around! DRM is a specific form of copy protection. Read the DRM article on Wikipedia: http://en.wikipedia.org/wiki/Digital_rights_management

  "The term [DRM] is also sometimes referred to as copy 
  protection, copy prevention, and copy control, although 
  the correctness of doing so is disputed."

And read http://en.wikipedia.org/wiki/Copy_protection