| 摘要 |
Audio, video or television apparatus, e.g. a satellite receiver/decoder, or a video cassette recorder, can be locked by a selected key press sequence, and unlocked by a related key press sequence. In case the key press sequence is forgotten, the apparatus is automatically unlocked a predetermined time period, e.g. 48 hours, after being locked. When locked, the depression of keys restarts the time period. With a broadcast receiving apparatus, the receiver may be locked in the off condition, or may be locked to a single channel, or may be locked so that a specified channel can not be received. |
