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DRM (digital restriction management) is a set of access control and management systems. Many global companies now use DRM, including Amazon, Apple, Microsoft, Electronic Arts, Sony, and others. The effectiveness of DRM has to be backed up by legal protection, authors say. Some argue that DRM as a system of copyright protection is ineffective: it provokes misunderstanding between suppliers and legitimate customers and levels competition in the market. In fact, Denuvo Anti-Temper is used to protect video games, but there are questions about the implementation.