You can read about it here (I got the news, and the link, from boingboing.net):
http://www.bekkelund.net/2012/10/22/...by-amazon-drm/
Saying that this is very disturbing is an understatement.
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UPDATE [Nov 16]
This thread has gradually morphed into a discussion of a proposal for an alternative "social DRM" scheme that leaves to media buyers the freedom to copy and share files, with limitations. If you are interested, you can find the last version of the proposal in post #356 at page 24.
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UPDATE [Oct 23]:
1) it now seems that remote deletion did not actually occur;
2) it's confirmed that Amazon closed the account due to unspecified "association" with another, previously blocked one, then refused to give any explanation to the user;
3) Amazon (due to the resonance this story is getting?) reactivated the account, again without any explanation.
You can find an update (it's in Norwegian, but if you use Google Translate you get a seemingly good translation) here:
http://www.nrk.no/kultur-og-underholdning/1.8368487