Artificially removing a book from a library after 2 years is reprehensible. Digital copies don't degrade. The publishers just want to be able to sell the same thing over and over to the same customer with no new work on their own part.
There won't be any need for Fahrenheit 451; the government will be able to simply force the publisher to stop selling it, and it will disappear.
But, the best part will be when you see the new paragraphs Anonymous adds to the books on your child's required reading list.
Let's all just support Project Gutenberg, and fight against Disney for copyright reform, instead: http://www.gutenberg.org/