this mark is NOT a registered trademark yet, on their site it states 'tm' this means it is in the process of being registered , in which case you can effect the registration if you are in time, talk to trademarks house, in any case just put a gap between stain and guard and they will have no grounds to complain, protection for word marks can be granted if sufficient use can be proven, this takes many years and thousands of pounds, even then they would need the money to proceed with any prosecution...by the looks of this particular outfit, i would take what they say with a pinch of salt.............