Amazon...amazon just refunds when you press button in Manage Your Kindle (you don't even need to contact Customer Service). Even if book was not sent via Whispernet but via 'Transfer over USB'. So it is technically possible to both get money back from amazon and keep file for this kindle. or remove DRM. it's all honor code.
Well, and rumors that they in fact have policy of either blocking returns or accounts if this feauture is abused:
http://www.the-digital-reader.com/20...return-policy/ and
http://www.the-digital-reader.com/20...indle-account/