What if you could rig it so that competing with your flagship product was against the law? Under 1998's Digital Millennium Copyright Act, breaking an anti-copying system is illegal, even if you're breaking it for a legal reason. For example, it's against the law to compete head-on with the iPod by making a device that plays Apple's proprietary music, or by making an iPod add-on that plays your own proprietary music. Nice deal for Apple.
Microsoft gets the same deal, courtesy of something called "Information Rights Management," a use-restriction system for Office files, such as Word documents, PowerPoint presentations, and Excel spreadsheets. (continue at source)
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