I created these MPAA rating slides, 1920 x 1080 png files for G, PG, PG-13, R and NC-17. WHile these slides may not be exact replicas, they do contain copyrighted information and a registered trademark, so they can only be used on movies that were rated by the Classification and Rating Administration and only with the rating that was actually assigned.
Even if you edit a rated movie, you cannot then change the classification yourself. In those instances, use your own rating screen, a saying such as "Edited for children" or "Not Rated", not these slides. Here is a sample of the G rating.