I was in on some mail list conversations months back on this subject.
As far as I can tell Holger is
working with REBOL, and isn't accepting registrations of any kind.
This dilemma could be solved by first "obtaining" a copy out there, then sending Holger his fee via snail mail etc.
This option was discussed also.
To keep a clear conciense you may possibly mail the registration fee by registered mail to Holgers Attention at REBOL. Either he accepts your payment possibly vaildating your pirated key, or he rejects it leaving you using your pirated key any way. :-?
Luckily I was able to register my 3.x key before he disappeared. I never did get DX, legit or pirated so I've never messed with those posibilities.
Plaz