In 2008 I started keeping track of every copyright infringement of my work that I was made aware of. Made aware of, meaning I rarely discover these myself. Most often I get an email that says something like “Did you do this?” or “Is this your design?” and what proceeds is a disclosure of someone or some place using my design without permission.

Great article on why copyright infringement happens from Von Glitschka at RockPaperInk.