US5418852A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Unauthorized use prevention method for optical disks, optical disk having unauthorized use prevention function, and optical disk apparatus
Assignee: Fujitsu Ltd
•
Filing: 1993-03-17
•
Granted: 1995-05-23
•
Expires: 2013-03-17
Abstract
Abstract In a method for preventing unauthorized use of a recording medium having a user accessible area and a user inaccessible area, first information is read from the user inaccessible area of the recording medium. The first information is compared with second information concerning a true recording medium (lawfully produced copy). It is then concluded that the recording medium is the true recording medium when the first information corresponds to the second information.
Inventors
- 👤 Satoshi Itami
- 👤 Kenichi Utsumi
- 👤 Masahiro Nakada
- 👤 Hiroshi Suzuki
- 👤 Kazunori Naito
- 👤 Kazuo Nakashima
- 👤 Toshikatsu Narumi
- 👤 Masaru Nakahara
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 20:48
CPC Classifications
G; G11; G11B; G11B23/00; G11B23/28; G11B23/283; G11B23/284; G06; G06F; G06F21/00; G06F21/10; G06F21/70; G06F21/78; G06F21/80; G11B20/00; G11B20/00086; G11B20/0021; G11B20/00485; G11B20/00557; G11B20/00572; G11B20/00615; G11B20/0092; G11B20/00927; G11B20/00949; G11B7/00; G11B7/002; G11B7/0037; G06F2211/00; G06F2211/007; G11B20/10; G11B20/12; G11B20/1217; G11B2020/1259
Claims Analysis
Total Claims: 64
Claim 1
Independent Claim
84 words
A method for preventing unauthorized use of a recording medium having a user accessible area and a user inaccessible area which can be accessed in an operational mode unusable by said user the method comprising the steps of: (a) reading first information from the user inaccessible area of the recording medium; (b) comparing the first information with second information concerning a true recording medium; and (c) concluding that the recording medium is the true recording medium when the first information matches the second information.
Claim 2
Independent Claim
84 words
A method for preventing unauthorized use of a recording medium having a user accessible area and a user inaccessible area which can be accessed in an operational mode unusable by said user the method comprising the steps of: (a) reading first information from the user inaccessible area of the recording medium; (b) comparing the first information with second information concerning a true recording medium; and (c) concluding that the recording medium is the true recording medium when the first information matches the second information.
Claim 3
Dependent Claim
41 words
The method as claimed in claim 1, wherein: the first information indicates a storage capacity of a rewritable area in the user accessible area; and the second information indicates a storage capacity of the rewritable area of the true recording medium.
Claim 4
Dependent Claim
42 words
The method as claimed in claim 1, wherein: the first information indicates a position of a dummy defective sector formed on the recording medium; and the second information indicates a position of the dummy defective sector formed on the true recording medium.
Claim 5
Dependent Claim
23 words
The method as claimed in claim 3, wherein the dummy defective sector is formed on a rewritable area in the user accessible area.
Claim 6
Dependent Claim
54 words
The method as claimed in claim 1, wherein: the first information indicates a number of sectors in a data area in the user accessible area which also has a spare area; and the second information indicates a number of sectors in the data area in the user accessible area of the true recording medium.
Claim 7
Dependent Claim
15 words
The method as claimed in claim 1, wherein the recording medium is an optical disk.
Claim 8
Dependent Claim
15 words
The method as claimed in claim 1, wherein the recording medium is a IC card.
Claim 9
Dependent Claim
17 words
The method as claimed in claim 1, wherein the second information is stored in an application program.
Claim 10
Dependent Claim
26 words
The method as claimed in claim 1, further comprising the step (d) of executing the step (a) immediately after execution of an application program is started.
Claim 11
Dependent Claim
28 words
The method as claimed in claim 1, further comprising the step (d) of executing the step (a) when an application program needs data stored on the recording medium.
Claim 12
Independent Claim
127 words
A method for preventing unauthorized use of a recording medium having a user accessible area and a user inaccessible area which can be accessed in an operational mode unusable by said user the method comprising the steps of: (a) reading first information from a storage portion of a read only area in the user inaccessible area, which can be accessed in an operational mode unusable by said user, of the recording medium using a predetermined address; (b) comparing the first information with second information designed to be stored in the storage portion of the read only area of a true recording medium specified by said predetermined address; and (c) concluding that the recording medium is the true recording medium when the first information matches the second information.
Claim 13
Independent Claim
127 words
A method for preventing unauthorized use of a recording medium having a user accessible area and a user inaccessible area which can be accessed in an operational mode unusable by said user the method comprising the steps of: (a) reading first information from a storage portion of a read only area in the user inaccessible area, which can be accessed in an operational mode unusable by said user, of the recording medium using a predetermined address; (b) comparing the first information with second information designed to be stored in the storage portion of the read only area of a true recording medium specified by said predetermined address; and (c) concluding that the recording medium is the true recording medium when the first information matches the second information.
Claim 14
Dependent Claim
15 words
The method as claimed in claim 11, wherein the recording medium is an optical disk.
Claim 15
Independent Claim
109 words
A method for preventing unauthorized use of a recording medium having a user accessible area and a user inaccessible area which can be accessed in an operational mode unusable by said user, the method comprising the steps of: (a) generating a write instruction to record data in a storage area of the recording medium specified by a predetermined address indicating a read only area of a true recording medium; (b) determining whether or not the data can be recorded on the recording medium; and (c) concluding that the recording medium is the true recording medium when it is determined that the data cannot be recorded on the recording medium.
Claim 16
Independent Claim
109 words
A method for preventing unauthorized use of a recording medium having a user accessible area and a user inaccessible area which can be accessed in an operational mode unusable by said user, the method comprising the steps of: (a) generating a write instruction to record data in a storage area of the recording medium specified by a predetermined address indicating a read only area of a true recording medium; (b) determining whether or not the data can be recorded on the recording medium; and (c) concluding that the recording medium is the true recording medium when it is determined that the data cannot be recorded on the recording medium.
Claim 17
Dependent Claim
43 words
The method as claimed in claim 13, further comprising the step (d) of recording dummy data on the storage area of the recording medium specified by the predetermined address when it is determined that the data can be recorded on the recording medium.
Claim 18
Dependent Claim
15 words
The method as claimed in claim 13, wherein the recording medium is an optical disk.
Claim 19
Independent Claim
107 words
A method for preventing unauthorized use of a recording medium having a user accessible area and a user inaccessible area which can be accessed in an operational mode unusable by said user, the method comprising the steps of: (a) reading predetermined information from a predetermined storage area of the recording medium, said predetermined information being necessary to read data from the user accessible area of the recording medium; (b) determining whether or not the predetermined information has been read from the predetermined storage area; and (c) concluding that the recording medium is a true recording medium when it is determined that the predetermined information has been read.
Claim 20
Independent Claim
107 words
A method for preventing unauthorized use of a recording medium having a user accessible area and a user inaccessible area which can be accessed in an operational mode unusable by said user, the method comprising the steps of: (a) reading predetermined information from a predetermined storage area of the recording medium, said predetermined information being necessary to read data from the user accessible area of the recording medium; (b) determining whether or not the predetermined information has been read from the predetermined storage area; and (c) concluding that the recording medium is a true recording medium when it is determined that the predetermined information has been read.
Claim 21
Dependent Claim
19 words
The method as claimed in claim 16, wherein said predetermined storage area is provided in the user inaccessible area.
Claim 22
Dependent Claim
21 words
The method as claimed in claim 16, wherein said predetermined information indicates positions of files recorded on the user accessible area.
Claim 23
Dependent Claim
27 words
The method as claimed in claim 16, wherein: said predetermined information is scrambled information; and the method further comprises the step (d) of descrambling the scrambled information.
Claim 24
Dependent Claim
213 words
The method as claimed in claim 17, wherein: the user accessible area comprises data fields and error correction code fields, error correction codes necessary for correcting error in data stored in the data fields being stored in the error correction code fields; one of the data fields and one of the error correction code fields are paired and adjacent to each other; and the true recording medium comprises a hidden error correction code stored in a predetermined one of the error correction code fields, said hidden error correction code correcting said predetermined information; the step (a) comprises the step (a-1) of reading one of the error correction codes from said predetermined one of the error correction code fields; the step (b) comprises the step (b-1) of determining whether or not error in said predetermined information can be corrected by said one of the error correction codes read from said predetermined one of the error correction code fields; and the step (c) comprises the step (c-1) of determining the recording medium is the true recording medium when it is determined that the error in said predetermined information can be corrected by said one of the error correction codes, in which said one of the error correction codes corresponds to said hidden error correction code.
Claim 25
Dependent Claim
15 words
The method as claimed in claim 16, wherein the recording medium is an optical disk.
Claim 26
Independent Claim
111 words
An apparatus for preventing unauthorized use of a recording medium having a user accessible area and a user inaccessible area which can be accessed in an operational mode unusable by said user, said apparatus; comprising: first means for reading first information from the user inaccessible area, which can be accessed in an operational mode unusable by said user of the recording medium; second means, coupled to the first means, for comparing the first information with second information concerning a true recording medium; and third means, coupled to said first and second means, for concluding that the recording medium is the true recording medium when the first information matches the second information.
Claim 27
Independent Claim
111 words
An apparatus for preventing unauthorized use of a recording medium having a user accessible area and a user inaccessible area which can be accessed in an operational mode unusable by said user, said apparatus; comprising: first means for reading first information from the user inaccessible area, which can be accessed in an operational mode unusable by said user of the recording medium; second means, coupled to the first means, for comparing the first information with second information concerning a true recording medium; and third means, coupled to said first and second means, for concluding that the recording medium is the true recording medium when the first information matches the second information.
Claim 28
Dependent Claim
41 words
The apparatus as claimed in claim 22, wherein: the first information indicates a storage capacity of a rewritable area in the user accessible area; and the second information indicates a storage capacity of the rewritable area of the true recording medium.
Claim 29
Dependent Claim
42 words
The apparatus as claimed in claim 22, wherein: the first information indicates a position of a dummy defective sector formed on the recording medium; and the second information indicates a position of the dummy defective sector formed on the true recording medium.
Claim 30
Dependent Claim
23 words
The apparatus as claimed in claim 24, wherein the dummy defective sector is formed on a rewritable area in the user accessible area.
Claim 31
Dependent Claim
54 words
The apparatus as claimed in claim 22, wherein: the first information indicates a number of sectors in a data area in the user accessible area which also has a spare area; and the second information indicates a number of sectors in the data area in the user accessible area of the true recording medium.
Claim 32
Dependent Claim
15 words
The apparatus as claimed in claim 22, wherein the recording medium is an optical disk.
Claim 33
Dependent Claim
15 words
The apparatus as claimed in claim 22, wherein the recording medium is a magneto-optical disk.
Claim 34
Dependent Claim
15 words
The apparatus as claimed in claim 22, wherein the recording medium is an IC card.
Claim 35
Dependent Claim
17 words
The apparatus as claimed in claim 22, wherein the second information is stored in an application program.
Claim 36
Dependent Claim
25 words
The apparatus as claimed in claim 22, further comprising fourth means for activating the first means immediately after execution of an application program is started.
Claim 37
Dependent Claim
27 words
The apparatus as claimed in claim 22, further comprising fourth means for activating the first means when an application program needs data stored on the recording medium.
Claim 38
Independent Claim
130 words
An apparatus for preventing unauthorized use of a recording medium having a user accessible area and a user inaccessible area which can be accessed in an operational mode unusable by said user, said apparatus comprising: first means for reading first information from a storage portion of a read only area in the user accessible area of the recording medium using a predetermined address; second means, coupled to said first means, for comparing the first information with second information designed to be stored in the storage portion of the read only area of a true recording medium specified by said predetermined address; and third means, coupled to said first and second means, for concluding that the recording medium is the true recording medium when the first information matches the second information.
Claim 39
Independent Claim
130 words
An apparatus for preventing unauthorized use of a recording medium having a user accessible area and a user inaccessible area which can be accessed in an operational mode unusable by said user, said apparatus comprising: first means for reading first information from a storage portion of a read only area in the user accessible area of the recording medium using a predetermined address; second means, coupled to said first means, for comparing the first information with second information designed to be stored in the storage portion of the read only area of a true recording medium specified by said predetermined address; and third means, coupled to said first and second means, for concluding that the recording medium is the true recording medium when the first information matches the second information.
Claim 40
Dependent Claim
15 words
The apparatus as claimed in claim 33, wherein the recording medium is an optical disk.
Claim 41
Independent Claim
124 words
An apparatus for preventing unauthorized use of a recording medium having a user accessible area and a user inaccessible area which can be accessed in an operational mode unusable by said user, said apparatus comprising: first means for generating a write instruction to record data in a storage area of the recording medium specified by a predetermined address indicating a read only area of a true recording medium; second means, coupled to said first means, for determining whether or not the data can be recorded on the recording medium; and third means, coupled to said first and second means, for concluding that the recording medium is the true recording medium when it is determined that the data cannot be recorded on the recording medium.
Claim 42
Independent Claim
124 words
An apparatus for preventing unauthorized use of a recording medium having a user accessible area and a user inaccessible area which can be accessed in an operational mode unusable by said user, said apparatus comprising: first means for generating a write instruction to record data in a storage area of the recording medium specified by a predetermined address indicating a read only area of a true recording medium; second means, coupled to said first means, for determining whether or not the data can be recorded on the recording medium; and third means, coupled to said first and second means, for concluding that the recording medium is the true recording medium when it is determined that the data cannot be recorded on the recording medium.
Claim 43
Dependent Claim
42 words
The apparatus as claimed in claim 35, further comprising fourth means for recording dummy data in the storage area of the recording medium specified by the predetermined address when it is determined that the data can be recorded on the recording medium.
Claim 44
Dependent Claim
15 words
The apparatus as claimed in claim 35, wherein the recording medium is an optical disk.
Claim 45
Independent Claim
122 words
An apparatus for preventing unauthorized use of a recording medium having a user accessible area and a user inaccessible area which can be accessed in an operational mode unusable by said user, said apparatus comprising: first means for reading predetermined information from a predetermined storage area of the recording medium, said predetermined information being necessary to read data from the user accessible area of the recording medium; second means, coupled to said first means, for determining whether or not the predetermined information has been read from the predetermined storage area; and third means, coupled to said first and second means, for concluding that the recording medium is a true recording medium when it is determined that the predetermined information has been read.
Claim 46
Independent Claim
122 words
An apparatus for preventing unauthorized use of a recording medium having a user accessible area and a user inaccessible area which can be accessed in an operational mode unusable by said user, said apparatus comprising: first means for reading predetermined information from a predetermined storage area of the recording medium, said predetermined information being necessary to read data from the user accessible area of the recording medium; second means, coupled to said first means, for determining whether or not the predetermined information has been read from the predetermined storage area; and third means, coupled to said first and second means, for concluding that the recording medium is a true recording medium when it is determined that the predetermined information has been read.
Claim 47
Dependent Claim
19 words
The apparatus as claimed in claim 38, wherein said predetermined storage area is provided in the user inaccessible area.
Claim 48
Dependent Claim
21 words
The apparatus as claimed in claim 38, wherein said predetermined information indicates positions of files recorded on the user accessible area.
Claim 49
Dependent Claim
26 words
The apparatus as claimed in claim 38, wherein: said predetermined information is scrambled information; and the apparatus further comprises fourth means for descrambling the scrambled information.
Claim 50
Dependent Claim
211 words
The apparatus as claimed in claim 38, wherein: the user accessible area comprises data fields and error correction code fields, error correction codes necessary for correcting error in data stored in the data fields being stored in the error correction code fields; one of the data fields and one of the error correction code fields are paired and adjacent to each other; and the true recording medium comprises a hidden error correction code stored in a predetermined one of the error correction code fields, said hidden error correction code correcting said predetermined information; the first means comprises fourth means for reading one of the error correction codes from said predetermined one of the error correction code fields; the second means comprises fifth means for determining whether or not error in said predetermined information can be corrected by said one of the error correction codes read from said predetermined one of the error correction code fields; and the third means comprises sixth means for concluding that the recording medium is the true recording medium when it is determined that the error in said predetermined information can be corrected by said one of the error correction codes in which said one of the error correction codes corresponds to said hidden error correction code.
Claim 51
Dependent Claim
15 words
The apparatus as claimed in claim 38, wherein the recording medium is an optical disk.
Claim 52
Dependent Claim
72 words
An optical disk comprising: a user accessible area; and a user inaccessible area which can be accessed in an operational mode unusable by said user, the user inaccessible area which can be accessed in an operational mode unusable by said user, comprising first information to be read and compared with second information concerning a true recording medium in order to determine whether or not the recording medium is the true recording medium.
Claim 53
Dependent Claim
72 words
An optical disk comprising: a user accessible area; and a user inaccessible area which can be accessed in an operational mode unusable by said user, the user inaccessible area which can be accessed in an operational mode unusable by said user, comprising first information to be read and compared with second information concerning a true recording medium in order to determine whether or not the recording medium is the true recording medium.
Claim 54
Dependent Claim
42 words
The optical disk as claimed in claim 44, wherein: the first information indicates a storage capacity of a rewritable area in the user accessible area; and the second information indicates a storage capacity of the rewritable area of the true recording medium.
Claim 55
Dependent Claim
43 words
The optical disk as claimed in claim 44, wherein: the first information indicates a position of a dummy defective sector formed on the recording medium; and the second information indicates a position of the dummy defective sector formed on the true recording medium.
Claim 56
Dependent Claim
24 words
The optical disk as claimed in claim 46, wherein the dummy defective sector is formed on a rewritable area in the user accessible area.
Claim 57
Dependent Claim
55 words
The optical disk as claimed in claim 44, wherein: the first information indicates a number of sectors in a data area in the user accessible area which also has a spare area; and the second information indicates a number of sectors in the data area in the user accessible area of the true recording medium.
Claim 58
Dependent Claim
96 words
An optical disk comprising: a user accessible area; and a user inaccessible area which can be accessed in an operational mode unusable by said user, the user accessible area comprising a storage portion of a read only area, said storage portion being specified by a predetermined address, first information being stored in said storage area to be read and compared with second information designed to be stored in the storage portion of the read only area of a true recording medium in order to determine whether or not the recording medium is the true recording medium.
Claim 59
Dependent Claim
96 words
An optical disk comprising: a user accessible area; and a user inaccessible area which can be accessed in an operational mode unusable by said user, the user accessible area comprising a storage portion of a read only area, said storage portion being specified by a predetermined address, first information being stored in said storage area to be read and compared with second information designed to be stored in the storage portion of the read only area of a true recording medium in order to determine whether or not the recording medium is the true recording medium.
Claim 60
Dependent Claim
57 words
An optical disk comprising: a user accessible area; and a user inaccessible area which can be accessed in an operational mode unusable by said user, predetermined information being stored in either the user accessible area or the user inaccessible area, the predetermined information being necessary to read data from the user accessible area of the recording medium.
Claim 61
Dependent Claim
57 words
An optical disk comprising: a user accessible area; and a user inaccessible area which can be accessed in an operational mode unusable by said user, predetermined information being stored in either the user accessible area or the user inaccessible area, the predetermined information being necessary to read data from the user accessible area of the recording medium.
Claim 62
Dependent Claim
22 words
The optical disk as claimed in claim 50, wherein said predetermined information indicates positions of files recorded in the suer accessible area.
Claim 63
Dependent Claim
15 words
The optical disk as claimed in claim 50, wherein said predetermined information is scrambled information.
Claim 64
Dependent Claim
197 words
The optical disk as claimed in claim 50, wherein: the user accessible area comprises data fields and error correction code fields, error correction codes necessary for correcting error in data stored in the data fields being stored in the error correction code fields; one of the data fields and one of the error correction code fields are paired and adjacent to each other; and the true recording medium comprises a hidden error correction code stored in a predetermined one of the error correction code fields, said hidden error correction code correcting said predetermined information, one of the error correction codes being read from said predetermined one of the error correction code fields in order to determine whether or not error in said predetermined information can be corrected by said one of the error correction codes read from said predetermined one of the error correction code fields, so that it is concluded that the recording medium is the true recording medium when it is determined that the error in said predetermined information can be corrected by said one of the error correction codes in which said one of the error correction codes matches said hidden error correction code.
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USPTO Annuity & Maintenance Windows
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| 11.5 Years (Year 12) | 2006-05-22 | 2006-11-21 | 2007-05-23 | $7700.00 | Window Closed / Lapsed |