The copyright infringement of software (also known as software piracy) refers to several practices which involve the unauthorize copying of computer software. Copyright infringement of this kind is extremely common in the United States, Mexico, China, Indonesia, Russia, Brazil, Zimbabwe and several other parts of the world. Most countries have copyright laws which apply to software, but they are better enforced in some countries than others. Since a dispute over WTO membership between Iran and USA, which led to the legalization in Iran of the distribution of software without the permission of any copyright holder (see Iran and copyright issues), there have been fears that world governments might try to use copyright laws and enforcement politically.