His personal page appears to have a link to the "approved" ebooks (http://www.informit.com/store/art-of-computer-programming-volume-1-fascicle-1-mmix-9780201853

His personal page appears to have a link to the "approved" ebooks (http://www.informit.com/store/art-of-computer-programming-volume-1-fascicle-1-mmix-9780201853926 http://www.informit.com/store/art-of-computer-programming-vo...).