7.5 Digital Rights Management

When a company publishes in digital form, whether it is a computer program, music, video, or a book, they face the piracy problem: Some people may make and sell copies without paying royalties to the copyright owner. In general, the problem of sharing digital data involves Transitive Trust, because anyone can make a copy of raw bits to share with others. This problem led to DRM techniques, which seek to prevent easy duplication of digital data.

In the early days of personal computing, most computer owners were hobbyists who spent money on relatively costly hardware. Back then, the cheapest diskette drive or hard drive cost more than an entire computer system costs today. Because software was relatively easy ...

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