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Amazon requires publishers to use Kindle DRM - Boing Boing.
A leaked Amazon ebook contract [PDF] shows that Amazon's default terms for ebook publishers is that they must use DRM, unless they can convince Amazon to leave it off.
Like most DRM vendors -- Apple and Google, for example -- Amazon spends a lot of time implying and flat-out stating that it only uses DRM because the big dumb media companies require it of them. The reality is that DRM's primary beneficiary is the DRM vendor. Once your book is sold with Amazon's DRM on it, only Amazon can give your readers permission to move them out of the Kindle jail and onto another device of your choosing. Of course Amazon wants to force copyright holders and creators to use its DRM -- it's a one-stop way of converting the writer's customer into Amazon's customer. Forever.