And THIS is why I get DRM-Free ePubs from O’Reilly and PragProg. From my O’Reilly download page:

You get lifetime access to ebooks you purchase through oreilly.com. Whenever possible we provide them to you in five DRM-free file formats — PDF, ePub, Kindle-compatible .mobi, DAISY, and Android .apk — that you can use on the devices of your choice.

Our ebooks are enhanced with color images, even when the print version is black and white. They are fully searchable, and you can cut-and-paste and print them. We also alert you when we’ve updated your ebooks with corrections and additions.

I need a change of pace, so my next review will probably be what I’m downloading now: Privacy and Big Data. Haven’t done a yellow book (InfoSec) for awhile.

As to the updates, I get about 2-5 emails a month from the vendors that new versions of my ebooks have less typos and fresh(er) information. Pure win.