Territory scoring is used in Japanese and Korean rules, as well as in many other countries in the world and on many on-line go servers. At the end of play dead stones are removed from the board and added to the prisoners. Each player's score is the sum of her territory plus prisoners.
To determine the score with territory scoring Japanese Counting is used.
See also: area scoring
noname: Points(territory) = Area − Moved Stones. so, “empty points in seki are not counted as territory” is wrong.