This post by  Devlin Hartline at Copyhype was Cross-posted on the Law Theories blog.

In the never-ending copyright debate, one often comes across certain words the usage of which both sides vehemently disagree upon. One such point of contention is the use of the word “theft” to describe copyright infringement. Ars Technica ran an article a few years back where Vice President Joe Biden was quoted as saying that “[p]iracy is flat, unadulterated theft.” Copyhype’s Terry Hart had a post a week later discussing the infringement-as-theft meme, mentioning the fact that even Justice Breyer, a copyright skeptic, had referred to deliberate infringement as “garden-variety theft.”1 The response from the other side of the debate was predictable, with the usual suspects demanding that copyright infringement is not theft—though the skeptics conspicuously neglected to define the word theft or to actually explain why it’s wrong to refer to infringement as theft.

READ THE FULL POST AT COPYHYPE:
http://www.copyhype.com/2013/09/why-copyright-infringement-is-theft/