If your product is required to be UL compliant and you want to the UL logo on 
the outside then the component parts also need to be UL compliant. The UL 
inspector will want to be able to trace the source of your PCB back to an 
approved supplier who is UL qualified to build that PCB and using the specified 
laminate material and required construction. The UL website has a logo lookup 
database which allows you to check this very quickly. Without the necessary 
markings its more dificult and bureaucratic to prove this.

Marking can be in silkscreen legend, does not have to be in copper

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