1893 - Thomas Edison received two U.S. patents. The first was for a "Cut Out for Incandescent Electric Lamps" and another for a "Stop Device" (No. 491,992-3). Also No. 492,150 for "Process of Coating Conductors for Incandescent Lamps."
... proposals.
Examples of existing "digital rights management" and "copy protection" systems:
Serial copy management system[?] (SCMS)
Macrovision
iTunes
...