BBC: "Versions of Windows XP intended for Microsoft's biggest
customers, who will put the software on hundreds or thousands of
machines, do not have to be activated. Instead they have a
'corporate key' built in.
Pirates have found and extracted
this key by making a byte-by-byte
comparison of retail and
corporate versions of XP.
Some websites are offering
copies of this corporate version,
or copies of the key to those that
do not want to pay to put the
software on more than one PC."