Cory Doctorow visits Microsoft to explain the history of technology, cryptography and copyright in one easy lesson:

Whenever a new technology has disrupted copyright, we've changed copyright. Copyright isn't an ethical proposition, it's a utilitarian one. There's nothing *moral* about paying a composer tuppence for the piano-roll rights, there's nothing *immoral* about not paying Hollywood for the right to videotape a movie off your TV. They're just the best way of balancing out so that people's physical property rights in their VCRs and phonographs are respected and so that creators get enough of a dangling carrot to go on making shows and music and books and paintings.