I'm not exactly the right person to answer you, but I will give it my best shot, at least in one aspect.
Others can correct me where I am wrong.
DRM is either "locked" or "free". The locked is the type that Kindle has and even Sony, when you buy ebooks from their store, and from several others ebook sites.
To stip it is to remove (and I don't know how it is done) the lock so that the book can become a free DRM.
The argument is that when you enter a bookstore and buy a book it is your's and you have the right to do with it as you want, read it, give it away, tear it up, build an alter and worship it, whatever suits your fancy.
We should have that same right with DRM books. When they are locked, we can't do what we want with them. So, some are removing the lock. I'm not computer savvy enough to figure out how to do it. And, of course, it is supposed to be against the law. An unfair law,but some believe that unfair laws are meant to be broken.
MR is not allowed to condon such actions, the stripping of DRM's, but I am sure that if you want to know about DRM you can check other discussion areas and ask for someone to contact you privately and give you information about what it is and how it works.
Janette