For most people that collect DVDs and games, they mainly collect ones released domestically or within their country. These collectors are unaware of a system that is used in these disks and the systems that run them. Though, anyone who is interested in foreign DVDs and games would have trouble with this system called "regional lockout".
Regional lockout is the system used by distributors of DVDs and games to control sales in other countries or regions. This system uses codes written on the individual disks and the players and consoles that run them. If a code on a disk doesn't correspond with a player, the player will refuse to play them and force them to be incompatible.
Regional lockout primarily benefits the distributors and publishers of these media regarding international sales as well as protecting them regarding different countries customs and laws. For those who do want to collect foreign DVDs and games or at least ones that just aren't available in their region, this system can be very aggravating and potentially expensive.
I'm particularly interested in Japan, its culture, and its media mostly anime and games. Because of this, I'm personally interested in the topic of regional lockout, but the main source I find on it is Wikipedia (whose own references are different articles on specific game consoles) or random forum posts. I intend to use this blog to be informative about it explaining some of the virtues and faults of the system. I admit that I am personally biased against regional lockout and wish that it would be abolished or removed in future releases of players and game consoles. But for the more informative sections, I intend to keep a balanced perspective explaining the topic.