It's impossible. It's impossible, because unless you want to reverse engineer a DRM product, you then run the risk of contravening not only the law, even though you are entitled to do so for accessibility purposes.... Once you start tampering with electronic files, you run the risk of compromising the content, which, quite honestly, I think is a more serious issue than running the risk of alienating or upsetting a publisher because you've broken their copyright.
On October 22nd, 2018. See this statement in context.