Keeping The Past Up To Date

From Orwell's 1984:

This process of continuous alteration was applied not only to newspapers, but to books, periodicals, pamphlets, posters, leaflets, films, sound-tracks, cartoons, photographs — to every kind of literature or documentation which might conceivably hold any political or ideological significance. Day by day and almost minute by minute the past was brought up to date.

From yesterday's New York Times:

This morning, hundreds of Amazon Kindle owners awoke to discover that books by a certain famous author had mysteriously disappeared from their e-book readers. These were books that they had bought and paid for.

The books? 1984 and Animal Farm.