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.
DVD movies have region codes, and they typically only play on a player or DVD-ROM drive sold in the country where the DVD movie was sold. The actual region code is in one byte on the DVD (digital versatile disc). The DVD player or drive has a region code in its firmware. Personal computer DVD-ROM players often have the code in the software or MPEG-2 decoder. The two codes must match for the player or drive to play the movie. The code is also printed on the back of a DVD package, superimposed on a small image of the globe.