Patent ID: 8369683

Claim:
A reproducing method for reproducing content data recorded in a recording medium, comprising: reproducing content data by a player unit in accordance with a reproduction control program read from the recording medium having recorded therein the content data including at least one of a video stream and an audio stream and the reproduction control program for controlling the reproduction of the control data; and controlling the reproducing based on only four states of the player unit defined by combinations of two states classified according to whether the content data is reproduced or not and two modes classified according to whether the control command corresponding to a user operation is accepted or not, the player unit entering one of the four states after initialization, and the player unit preventing any transition out of the only four states such that no other states are allowed by the player unit, the two modes being a first mode in which the user operation is ignored and a second mode where the control command is issued based on the user operation.