Interesting. Starting with #1485, the merchant changed from "Ralph Schmidt Software Entwicklung" to an email address containing the string "Mariak". And trying out random numbers below 1500 reveals that there are many licenses which have not been paid for, thus not resulting in a keyfile issued.
Edit: changed the actual email address string to a non-spammable description as requested by the email address owner. Furthermore, the registration system has been altered so that now the merchant is not publicly viewable anymore and also the registration status for registration numbers can't be examined anymore.
