The Jargon File (version 4.4.7, 29 Dec 2003):

copy protection
 n.

    A class of methods for preventing incompetent pirates from stealing
    software and legitimate customers from using it. Considered silly.


The Free On-line Dictionary of Computing (30 December 2018):

copy protection

    Any technique designed to prevent unauthorised
   copying of software.  Such techniques will only hinder the
   most incompetant attempts at software theft but often
   prevent legitimate customers from using products they have
   paid for in the way they want.  Considered silly.

   [Jargon File]

   (2010-02-03)