A reproof may mean several different things, depending on what the artist intented to say. Some possibilities are: 1. that an original piece has been reworked so as to eliminate what was considered to be faulty. 2. a new negative has been made 3. a work of art has been touched up (perhaps because the piece was damaged or peeling due to age) 4. a copy has been made from an original ("a reproofed copy").