[WiseWeasel]

I'm not so sure that this type of book-burning is tied to the physicality of books, rather than a symbol of rejection. Certainly, there have been instances throughout history, such as when the Nazi government or the Catholic Church have carried out organized purges of particular written works on a societal level, where the supply of the work has been materially impacted to the point that it is difficult to obtain.

But I assume you're referring more to examples such as this story, of small groups using book-burning as a publicity stunt, or a public symbol of their rejection of the work. In those cases, I doubt the lack of physicality makes any difference; if they wanted to protest a digital-only book, they'd simply print it out on something flammable first.

[renegadedev]

Good point. I was not necessarily referring to the physicality of books but the notion these book-burners subscribe to, that if they symbolically burn a book, the idea will perish. Your point of the Nazis burning the books out of supply only illustrates the point that to burn a book in the hope that the idea will perish, did not necessarily work.