The whole principle behind free software is that you should be free to do with it as you will - that is, if you find an exasperating bug that's been knawing at you for centuries, you have the freedom to go through the source and fix it.

This doesn't really apply to books, since errors in books don't affect your ability to get stuff done in the way software bugs do.

(Real-world example: I found several errors in a book I bought; I was able to change my code accordingly and move on).

D

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