"Theft"
Copyright holders frequently refer to copyright infringement as theft. In copyright law, infringement does not refer to theft of physical objects that take away the owner's possession, but an instance where a person exercises one of the exclusive rights of the copyright holder without authorization.[6] Courts have distinguished between copyright infringement and theft holding, for instance, in the United States Supreme Court case Dowling v. United States (1985), that bootleg phonorecords did not constitute stolen property and that "interference with copyright does not easily equate with theft, conversion, or fraud. The Copyright Act even employs a separate term of art to define one who misappropriates a copyright: '[...] an infringer of the copyright.'" The court said that in the case of copyright infringement, the province guaranteed to the copyright holder by copyright lawcertain exclusive rightsis invaded, but no control, physical or otherwise, is taken over the copyright, nor is the copyright holder wholly deprived of using the copyrighted work or exercising the exclusive rights held.[1]
This part is important. Theft has to deprive some one of control of an item. Copyright infringement does not.
It is not theft to buy a copy of CD X copy it 1000 times and then sell it in another country where you do not sell your product. It is copyright infringement. I didn't deprive you of the music. The end result is I deprived you of potential profits (real or imaginary) but technically I didn't deprive you of anything because you didn't offer your CD for sale in kluckkluckstan.