My understanding is that the protection aspect only requires the trademark holder to prevent unauthorised use. There's nothing stopping them from accepting his

My understanding is that the protection aspect only requires the trademark holder to prevent unauthorised use. There's nothing stopping them from accepting his terms (Only used within a specific phrase, etc) and granting him a licence to use it for a nominal fee. That can all be done with a minimum of lawyering, and without getting courts involved at all.