METHOD FOR PROTECTION OF DATA TRANSMISSION ACCORDING TO MEDIUM PROTECTION DATA AND FIRST AND SECOND ADDITIONAL PROTECTION DATA TO DETERMINE A RANGE OF PROTECTION FOR MAIN DATA AND WHETHER THE MAIN DATA ARE TRANSMITTED IN THEIR ENTIRETY, PARTIALLY, OR NOT AT ALL
View Patent ↗In a reproduction apparatus, for reproducing an original signal conveyed as main data by a data medium such as a recording disk or broadcasting system, with medium protection data which are specific to the data medium being conveyed together with the main data, the apparatus includes a section for generating apparatus protection data which are specific to the reproduction apparatus, a section for combining the apparatus protection data with the medium protection data to define a protection level, and a section for applying the protection level to restrict reproduction of the original signal, with stepwise variations in restriction occurring in accordance with changes in protection level. The medium protection data may include information for specifying restricted reproduction of portions of the original signal, such as by producing degraded resolution within specified regions of specified frames of a video signal.
1. A transmission method for operating on information which is transmitted through a medium and comprises main data which are to be transmitted, the method comprising the steps of:
detecting medium protection data which are specific to said medium and are also transmitted through said medium;
generating additional protection data which comprise at least first additional protection data and second additional protection data,
wherein said first additional protection data are specific to a region or a country in which said main data are to be transmitted, and can not be modified by a recipient of said transmitted main data, and wherein said second additional protection data can be modified by the recipient to selectively define a plurality of protection levels including at least two levels which are respectively specific to adults and to children;
defining a protection level based on said medium protection data and said additional protection data in combination; and
executing transmission of said main data in accordance with said protection level,
wherein the combination of said medium protection data and said first additional protection data specifies that said main data are transmitted either in their entirety or not at all, and the combination of said medium protection data and said second additional protection data specifies that said main data are transmitted in their entirety, partially, or not at all,
wherein, for each combination of protection levels based on said medium protection data and said additional protection data, there is a corresponding range of one or more possible values of final protection level, said corresponding range extending from a least severe value to a most severe value.
2. The transmission method as recited in claim 1 , wherein said medium transmits both said medium protection data and said main data in an identical form.
3. The transmission method as recited in claim 1 , further comprising the step of transmitting both said medium protection data and said main data through said medium in an identical form.
4. The transmission method as recited in claim 1 , wherein said step of executing transmission of said main data comprises:
transmitting said main data either in their entirety or not at all, in accordance with said combination of said medium protection data and said first additional protection data, and
transmitting said main data in their entirety, partially, or not at all, in accordance with said combination of said medium protection data and said second additional protection data.