The Marrakesh Treaty, adopted by the World Intellectual Property Organization in 2013, requires signatory countries to build exceptions into their copyright law so that authorized bodies can create and share accessible-format copies of books and other published works, in braille, large print, audio, or accessible digital text, for people who are blind, have low vision, or are otherwise print disabled.
It also allows these accessible-format copies to be exchanged across international borders, letting organizations that create them for one country’s print-disabled population share that work internationally rather than duplicating it in every jurisdiction separately.