Microsoft

DRM is built into the heart of Windows, and many Microsoft services, like Silverlight, push DRM on users. In some cases, Microsoft has added these restrictions at the behest of TV companies, Hollywood, and the music industry. In other cases, Microsoft DRM goes way beyond these companies' demands, such as their heavy use of DRM in the Xbox, which suggests that Microsoft is using DRM simply to create lock-in. Whether Microsoft is merely a co-conspirator with big media companies or an advocate for DRM in their own right, the result for software users is the same. By using Windows, you give control of your computer to the media industry.