Good to have your company, HockeyDaft. DRM (Digital Rights Management) as far as ebooks are concerned are padlocks that remove the buyer's freedom to read his book on whatever platorm he wants or to fairly share it with family or friends.
Originally introduced to protect the copyright of manufacturers of pianola rolls, some publishers and retailers (notably the big ones) apply it to deter pirates. It doesn't, of course, because it is not difficult to strip and, anyway, most pirated books are simply scans of best-selling hardbacks, some of which (like the Harry Potter series), have never been 'officially' published in digital forms.
What DRM actually does is to make a fool of honest buyers and -- naturally -- to encourage superfluous and unnecessary multiple purchases of a single title by a single buyer.
DRM ain't cricket, HockeyDaft.
Best wishes. Neil
PS: There's a little more detail and a proper rant in my website's blog here:
http://bewritebooks.blogspot.com/201...t-read-me.html