Data nullification device for nullifying digital content recorded on a recording medium, after the digital content has been reproduced, a predetermined time period has passed since the recording of the digital content, or the digital content has been moved to another recording medium
First Claim
Patent Images
1. A computing device comprising:
- a recording medium operable to record target data, the target data being made up of a plurality of data blocks;
a reproducing unit operable to reproduce the target data from the recording medium;
a first judging unit operable to judge, for each data block recorded on the recording medium, whether the data block needs to be nullified when the data block is reproduced from the recording medium;
a sequential nullifying unit operable to destroy only a part of the reproduced data block judged as needing to be nullified while the reproducing unit reproduces the target data from the recording medium, the part of the reproduced data block including data necessary to reproduce remaining parts of the reproduced data block judged as needing to be nullified, the remaining parts being unable to be reproduced without the part of the reproduced data block judged as needing to be nullified;
a total nullifying unit operable to destroy all of the remaining parts that have not been destroyed by the sequential nullifying unit; and
a processing capacity judging unit operable to judge whether the computing device has a processing capacity sufficient to destroy all of the remaining parts while the reproducing unit reproduces the target data from the recording medium, and to control the total nullifying unit to destroy all of the remaining parts when the processing capacity judging unit judges that the computing device has the processing capacity sufficient to destroy all of the remaining parts.
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Abstract
In a data nullification device for nullifying target data recorded on a recording medium, target data is made up of a plurality of data blocks. A judging unit judges, in units of data blocks, whether the target data needs to be nullified. A nullifying unit nullifies, when a predetermined number of data blocks are judged as needing to be nullified or when one or more data blocks whose total amount of data reaches a predetermined amount are judged as needing to be nullified, the judged data blocks.
48 Citations
29 Claims
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1. A computing device comprising:
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a recording medium operable to record target data, the target data being made up of a plurality of data blocks; a reproducing unit operable to reproduce the target data from the recording medium; a first judging unit operable to judge, for each data block recorded on the recording medium, whether the data block needs to be nullified when the data block is reproduced from the recording medium; a sequential nullifying unit operable to destroy only a part of the reproduced data block judged as needing to be nullified while the reproducing unit reproduces the target data from the recording medium, the part of the reproduced data block including data necessary to reproduce remaining parts of the reproduced data block judged as needing to be nullified, the remaining parts being unable to be reproduced without the part of the reproduced data block judged as needing to be nullified; a total nullifying unit operable to destroy all of the remaining parts that have not been destroyed by the sequential nullifying unit; and a processing capacity judging unit operable to judge whether the computing device has a processing capacity sufficient to destroy all of the remaining parts while the reproducing unit reproduces the target data from the recording medium, and to control the total nullifying unit to destroy all of the remaining parts when the processing capacity judging unit judges that the computing device has the processing capacity sufficient to destroy all of the remaining parts. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
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17. A computer readable medium storing a computer program, the computer program being utilized by a computer for nullifying at least a part of target data recorded on a recording medium, the computer readable medium comprising:
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a recording code segment for recording target data on the recording medium, the target data being made up of a plurality of data blocks; a reproducing code segment for reproducing the target data from the recording medium; a first judging code segment for judging, for each data block of the target data, whether the data block needs to be nullified when the data block is reproduced from the recording medium; a sequential destroying code segment for destroying only a part of the reproduced data block judged as needing to be nullified while the target data is reproduced from the recording medium, the part of the reproduced data block including data necessary to reproduce remaining parts of the reproduced data block judged as needing to be nullified, the remaining parts being unable to be reproduced without the part of the reproduced data block judged as needing to be nullified; a second judging code segment for judging whether a sufficient processing capacity at the computer exists to destroy all of the remaining parts that have not been destroyed by the sequential destroying code segment; and a total destroying code segment for destroying all of the remaining parts while the target data is reproduced from the recording medium, when it is judged that there is the sufficient processing capacity to destroy all of the remaining parts. - View Dependent Claims (18, 19, 20, 21, 22)
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23. A data nullification method for nullifying at least a part of target data recorded on a recording medium, the data nullification method comprising:
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recording the target data on the recording medium, the target data being made up of a plurality of data blocks; reproducing the target data from the recording medium; judging, for each data block recorded on the recording medium, whether the data block needs to be nullified when the data block is reproduced from the recording medium; destroying only a part of the reproduced data block judged as needing to be nullified while the target data is reproduced from the recording medium, the part of the reproduced data block including data necessary to reproduce remaining parts of the reproduced data block judged as needing to be nullified, the remaining parts being unable to be reproduced without the part of the reproduced data block judged as needing to be nullified; judging whether a sufficient processing capacity exists to destroy all of the remaining parts that have not been destroyed while the target data is reproduced from the recording medium; and destroying all of the remaining parts when it is judged that there is the sufficient processing capacity to destroy all of the remaining parts. - View Dependent Claims (24, 25, 26, 27, 28, 29)
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Specification