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[dvd-discuss] Gedankenexperiment



Please shoot this down on either technical or legal grounds:

The MP3.com "my MP3.com" model, where MP3.com kept pre-ripped
copies of music for customers who already had the CDs, *probably*
could have been made resistant to legal objections if the copies were
encrypted.  "Encrypted how?" you ask.  Suppose that they were
symmetrically block-cipher encrypted using the RC5 checksum of the
original track.

Trivially easy to extract and keep on a keyring if you have the original
CD, annoying enough to break if you don't.  Of course people could
trade checksums, but then they can trade tracks too.

(Yes, somewhat OT but at least less so than the spam discussion!)

-- 
| I'm old enough that I don't have to pretend to be grown up.|
+----------- D. C. Sessions <dcs@lumbercartel.com> ----------+