[DNSB]

Just to toss in my nickel's worth.

<start grammar rant>
Advise is a verb. I would advise you that that course of action is not going to give the desired result.

Advice is a noun. My advice to you is that you find a better dictionary.

So I advise the original suggestion about the title of this thread was correct. The OP is looking for advice though we can advise him.
<end grammar rant>

As for the original question, my opinion is that purchasing a Kindle and then removing DRM from library books to format change them is not acceptable behaviour.

Your moral compass may vary.

Edit: As I was just told in a PM, I'm being a hypocrite. I don't think that being willing to remove DRM from books to which I can claim ownership (liscensee-ship?) but not being willing to remove DRM from a borrowed book is hypocritical. Simply put, one is mine, the other isn't.

"The problem with defending the purity of the English language is that English is about as pure as a cribhouse whore. We don’t just borrow words; on occasion, English has pursued other languages down alleyways to beat them unconscious and rifle their pockets for new vocabulary." --James D. Nicoll