Read this: Corporations and legislatures take different types of preventative measures to deter copyright infringement, with much of the focus since the early 1990s being on preventing or reducing digital methods of infringement. Strategies include education, civil & criminal legislation, and international agreements, as well as publicizing anti-piracy litigation successes and imposing forms of digital media copy protection, such as controversial DRM technology and anti-circumvention laws, which limit the amount of control consumers have over the use of products and content they have purchased.
Now answer this question, if there is an answer (If it cannot be answered, return "unanswerable"): What does DRM and anti-circumvention laws do?
limit the amount of control consumers have