""Print disabled" books are those that have been specially formatted in the DAISY format for users who can not read regular print books. These titles are only accessible on a specialized device to patrons having a key issued by the Library of Congress."
"The Digital Accessible Information SYstem (DAISY) format is a means of creating digital talking books for people who wish to hear--and to navigate--written material presented in an audible format. DAISY helps those with "print disabilities," including blindness, impaired vision, and dyslexia, to read electronic texts that have been converted into its format. The DAISY consortium was formed in 1996 by talking book libraries around the world to lead the transition from analog talking books into digital format."
Imagine; machine readable, content separated from presentation, no mandatory awful UI, no DRM; dreadful. Good thing it's restricted to special Library issued keyholders only. /s