BC and AD are abbreviations for before Christ and Anno Domino mean before the Christ's birth after the Christ's birth
Standard DVDs. 1  Region 1: U.S., U.S. Territories, Canada, and Bermuda. 2  Region 2: Japan, Europe (excluding Russia, Belarus and Ukraine), Greenland, South Africa, Swaziland, Lesotho, Egypt and the Middle East. 3  Region 3: Southeast Asia, South Korea, Taiwan, Hong Kong and Macau.
There are some foreign DVDs sold in North America which have a region code of 1, including films produced in the UK that are intended for sale in North America. The reason why is that the North American market is large enough to justify a separate North American release of very popular films.