User blog comment:TUSF/"Rainbow Bridge" Side Story/@comment-73.180.140.160-20140406163049/@comment-26391060-20140406194518

Region 1, as in BD/DVD Region 1(Not sure if it is BD or DVD being mentioned). As you know, For the sack of protecting the right of copyright holder (although I don't know how it would protect their right), the world had been divided into 9 regions for DVD and 3 regions and BD, and DVD/BD published in a specific region cannot be player on devices sold in another region.