DeDRM Tools is a great software package which comes with a Calibre plugin that automatically removes the DRM of the ebooks you add (in addition to standalone DRM removing apps):
https://apprenticealf.wordpress.com/2015/09/04/dedrm-tools-6...
https://apprenticealf.wordpress.com/2015/09/04/dedrm-tools-6...
It's like buying an iphone and then jailbreaking it: I'm all for it, but it does not change the reality that you have just financed apple practices to the tune of hundreds of dollars. For ebooks the sums are much smaller, and clearly compromising if there is no alternative more acceptable, but the problem remains.