I am currently blocking a visitor to one of our web sites who is using the User-Agent...
BrightSign/5.1.46-td (XD1230) Mozilla/5.0 (compatible; Linux mips) AppleWebKit/537.4 (KHTML, like Gecko) Chromium/18.0.1025.168 Chrome/18.0.1025.168 Safari/537.4
From their SE results this claims to be...
"Solid State Digital Sign Controllers Without a PC"
and
"BrightSign HD and 4K media players for information displays, digital signage, message boards and network media player solutions"
I downloaded a PDF but neither it nor the web pages I looked at made any sense without knowing the actual context.
I submitted a form on their web site a few days ago saying they ought to redo the UA and got back "too many characters, try again". Which I did, asking them to email me for further details. Nothing so far.
It's still blocked here.