Clone gnICE+ license

Hello,
One of our 3rd party willing to make and sell "gnICE+ clone" due to seems no more available current "gnICE+" on shop.
But there seems no information about license of gnICE+. (I suppose because of gnICE+ is open H/W).
He just would like to confirm it is OK or not to make and sell gnICE+ clone by himself

or there are some limitation or contract with ADI.

I appreciate if you have any advice of this.

Best regards,

Sofy