I don't think tombstone should fall into copyright, it's commission and not sth the company who engraves is advertising or selling as products.
They could probably get amateur engrave it if not professional company as commission anyways. Sometimes going the right way- asking permission from company and such is not best way to approach things.
They could probably get amateur engrave it if not professional company as commission anyways. Sometimes going the right way- asking permission from company and such is not best way to approach things.