In a written statement to IGamingNews, Microgaming Software Systems Ltd. has confirmed that some of its larger United States-facing licensees agreed last week to discontinue registering new American customers -- others, though, have pulled out entirely.
The Isle of Man software developer said uncertainty existed among those licensees about the commercial future of online gambling in the States.
It is not known whether the decision was made in anticipation of the UIGEA regulations being issued.
Already, the company's policy was to not take play from 13 states, including Kentucky, where the domain names of a number of its licensees remain under threat of seizure by the Kentucky government.
"In light of these decisions, Microgaming did not believe it was worth the remainder of US-facing licensees keeping their systems available for new registrations, given the technical difficulties of maintaining an effective screening for all circumstances," Janine Woodford, a spokesperson for the company, wrote in an e-mail.
"After consultation with these remaining licensees, Microgaming will from today be implementing the licensees' decisions not to accept new US registrations," she added.
Ms. Woodford did not offer further detail on how Microgaming would be impacted, financially, by the policy change.
IGN acknowledges that at least one of the company's poker and casino licensees, DoylesRoom, is rumored to be seeking a different supplier to continue serving American residents. IGN has contacted DoyelsRoom marketing staff and is awaiting reply.