Sharing these as some here might find them interesting. Rather than just display an error message on a black screen, Blu Ray discs from Eureka have individual screens and messages when there is a region mismatch between disc and player. Some are really simple and just have the error message overlaid on the image used for the main menu. Others feature a still from the film with some in particular having specific shots clearly chosen to reflect the fact it’s a bit crappy that you are even seeing the screen and possibly unable to play the disc. They’re very clear that the region-locking isn’t their choice with some of the text being very direct and to the point about what the author thinks of region-locking. Gate of Hell, Silent Running and especially Island of Lost Souls don’t pull punches in condemning these restrictions. It’s such a small thing but it’s kinda neat that someone went out of their way with these, especially on multi-disc sets with different images on the different discs.
Curiously enough, their Drunken Master release is actually region-free so it doesn’t have one.