Yes, thanks. I was being insufficiently specific/accurate. Yes, we're talking about a Blu-ray disc. And yes, I'm aware regarding Blu-ray regions (A,B,C) and their difference from DVD regions (1,2,3,4,5). But my player has only the option to set region via menu by country and the consequent region is assigned in the code. It shows as "1" from setting it to United States even though for Blu-ray that would be "A". The player handles both DVD and Blu-ray so I assumed it was only displaying the DVD region code but internally applied the correct/comparable Blu-ray region code.
Thanks again for your help.