Semiconductor device for compressing video signals with copy protection information
View Patent ↗A semiconductor device capable of deleting data already recorded on a recording medium when information indicative of prohibition of copying is detected from picture signal. Input portion receives an input picture signal, and copy protection information detecting portion detects copy protection information included in the picture signal input from the input portion. Compressing portion compresses the picture signal, and compressed data output portion outputs compressed data obtained by the compressing portion. Specification information output portion generates and outputs specification information specifying a position of the compressed data where the information indicative of prohibition of copying was detected first by the copy protection information detecting portion. A device for recording the compressed data can specify the head of unnecessary compressed information by looking up the specification information, whereby the unnecessary information can be deleted from the recording medium.
1. A method comprising:
receiving a picture signal;
detecting copy protection information included in the received picture signal;
compressing the received picture signal;
outputting the compressed picture signal;
outputting specification information indicating for which part of the compressed picture signal the detected copy protection information takes effect on, as determined from a head position where the copy protection information is first detected, the copy protection information indicating copying is prohibited; and
specifying and deleting, based on the specification information, a part of the compressed data that has been recorded on a storage unit even though copying is prohibited, after detecting more than one time that the copy protection information indicates that copying is prohibited.
2. A method of deleting portions of compressed data, comprising:
outputting specification information indicating which part of the compressed data includes copy protection information, as determined from a head position in a storage unit where the copy protection information is detected; and
specifying and deleting, based on the specification information, at least a part of the compressed data after confirming more than one time that the copy protection information indicates that copying is prohibited.
3. A semiconductor device for compressing picture signal, comprising:
an input portion for receiving a picture signal;
a copy protection information detecting portion for detecting copy protection information included in the picture signal input from the input portion;
a compressing portion for compressing the picture signal;
a compressed data output portion for outputting compressed data obtained by the compressing portion;
a specification information output portion, coupled to said copy protection information detecting portion and compressing portion, for outputting specification information indicating which part of the compressed data the detected copy protection information takes effect on, as determined from a head position where the copy protection information is first detected, the copy protection information indicating copying is prohibited; and
a data deletion portion, which specifies and deletes, based on the specification information, a part of the compressed data that has been recorded on a storage unit even though copying is prohibited when the copy protection information detecting portion detects more than one time that the copy protection information indicating copying is prohibited.
4. The semiconductor device according to claim 3 wherein, when the copy protection information has been detected a plurality of times by the copy protection information detecting portion, the specification information output portion outputs information specifying at least one of a set of copy protection information detected the plurality of times.
5. The semiconductor device according to claim 3 wherein the specification information indicates an amount of data from a head of the compressed data to the corresponding part of same, to thereby specify a position where the copy protection information has been detected.
6. The semiconductor device according to claim 3 , further comprising compressing operation stopping portion for stopping compressing operation of the compressing portion when the copy protection information has been detected a predetermined number of times by the copy protection information detecting portion.
7. An apparatus comprising:
means for receiving a picture signal;
means for detecting copy protection information included in the received picture signal;
means for compressing the received picture signal;
means for outputting the compressed picture signal;
means for outputting specification information indicating for which part of the compressed picture signal the detected copy protection information takes effect on, as determined from a head position of the part where the copy protection information is first detected, the copy protection information indicating copying is prohibited; and
means for specifying and deleting, based on the specification information, a part of the compressed data that has been recorded on a storage unit even though copying is prohibited when the means for detecting copy protection information detects more than one time that copying is prohibited according to the copy protection information.