DVD Xcopy was a US company and forced out of business due to the DMCA which prohibits the breaking of any security measures in place by software.

The makers of DVD Xcopy used to maintain a server that would activate products already in circulation. It doesn't sound like that's still the case.

Do a Google search, there may be a way to get it activated another way.

There are free programs out there to do the same job. Although technically it's illegal in the U.S. to break the encryption on the DVD, even to make a personal backup.