mivox - 11:32 pm on Sep 10, 2004 (gmt 0)

mail it to myself (to get a postmark date)

Be extra thorough: take the sealed envelope to a notary public, have them stamp and sign the envelope OVER the sealed flap, put a piece of glass-tape over the notary seal, and THEN have it sent to yourself via certified mail.

Or, better yet, register the contents of the CD with the copyright office. ;)