There you have it, Montag. It didn't come from the Government down. There was no dictum, no declaration, no censorship, to start with, no! Technology, mass exploitation, and minority pressure carried the trick, thank God.

This quote is from a longer section in part I of the book as a conversation between Montag and Beatty, the speaker above.

(Footnote: In the same way the electronic version [only] of 1984 was recalled by Amazon and deleted from users' devices [1]. The book F451 itself was bowdlerized by the publisher from 1967 to 1980 until the Bradbury found out, got seriously upset with the publisher and then forced them to publish only the original version.

[1] https://io9.gizmodo.com/amazon-secretly-removes-1984-from-the-kindle-5317703
Amazon got the ebook version from someone who said they had the rights, but did not. 1984 is about to or recently went the public domain and later this year Amazon is expected to have the ebook for sale again.)