The following email came over yesterday:
Sent: Monday, July 03, 2000 9:13 AM
Subject: CloneCD announcement!
Starting with CloneCD release version 6 we will be changing the format of the serial registration number. If you wish to receive further updates of cloneCD we will require your present CloneCD serial. Once we receive it, we will present you with a new one.
(Please send your present serial to email@example.com)
Of course this email is a hoax and doesn't come from the CloneCD author! So be careful about such emails…