The Vault Single User Edition is dead...
13 Feb 2004

... Long live the Vault Single User Edition

With our new pricing for Vault, some readers will note that we have eliminated the "Single User Edition".  Previously priced at $49, this offering was quite popular with self-employed consultants and their ilk.  In place of the Single User Edition product, we have implemented what could be called an "Implicit Single User Edition".  In a nutshell, Vault is now free for one user.  Just download the Vault binaries and install them.  You don't need a serial number at all.  With no serial numbers, Vault 2.0 is hard-coded to behave as if there is one license.