Probably because its relatively new, only in the past couple years has it become big enough to gain attention. TPB has only been around since late 2004, my US history book (latest edition) only goes up to the election of 2004.
Also, it would promote innovation if it would just end after the creator died. The fact that people on the Internet can not remix Elvis's work and show it to everyone else is ridiculous and that is just one example of how it stifles innovation.
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