Every once in a while, we have a fun discussion around here on how permanent our (sometimes outrageously expensive) Logos purchases are.
Here's a little gasoline to throw on the fire. 
https://www.wired.com/story/microsoft-ebook-apocalypse-drm/
I say that tongue in cheek, as one of those who is NOT converting his library to digital (a smart but expensive decision). I get needled for it so I like to needle those who are converting whenever I can. 