Video piracy is a global criminal activity that has branched out from digital piracy of copyrighted software, music, and videos. It involves the illegal recording and distribution of movies, and has resulted in estimated losses of $18 billion for the movie industry annually. There are two main types: bootlegging through recording movies in theaters, and illegal copying from DVDs or other sources. While many measures have been taken to stop piracy through legislation and lawsuits, it remains difficult to control due to ongoing battles between the industry and consumers over copyright laws. Social learning theory has been used to explain why people engage in piracy through observing and imitating the behavior of others.