For the sake of completeness, the info Hyperion require to transfer an OS4 license is:
1) The serial number of the OS4 CD
2) The Amigaworld.net user name of the previous registered owner.
3) An e-mail from the previous owner authorising the transfer.
WTF? How can they possibly assume that all A1-owners were registered on Amigaworld.net?
Btw, they didn't by any chance also ask you to sacrify a leg for getting a copy of OS4?