Method and system for securing local database file of local content stored on end-user system

• US 7,228,437 B2
• Filed: 06/19/2001
• Issued: 06/05/2007
• Est. Priority Date: 08/13/1998
• Status: Expired due to Fees

• Current Assignee: International Business Machines Corporation
• Original Assignee: International Business Machines Corporation
• Inventors: Mahlbacher, James C., Zhao, Ting, Spagna, Richard L., Geisler, Douglas R.
• Primary Examiner(s): Revak; Christopher
• Assistant Examiner(s): Abrishamkar; Kaveh
• Application Number:
  US09/884,618
• Publication Number:
  US 20020002468A1
• Time in Patent Office: 2,177 Days
• Field of Search: 713/193, 713/194, 713/165, 726/26, 380/228
• US Class Current: 713/193
• CPC Class Codes: G06F 21/1013 to locations
• CPC Class Codes: G06F 21/16 Program or content traceability, e.g. by watermarking
• CPC Class Codes: G06F 2211/007 Encryption, En-/decode, En-/decipher, En-/decypher, Scramble, (De-)compress
• CPC Class Codes: G06F 2221/2107 File encryption
• CPC Class Codes: G06F 2221/2135 Metering
• CPC Class Codes: G06T 1/0021 Image watermarking
• CPC Class Codes: G06T 2201/0064 for copy protection or copy management, e.g. CGMS, copy only once, one-time copy
• CPC Class Codes: G11B 20/0021 involving encryption or decryption of contents recorded on or reproduced from a record carrier
• CPC Class Codes: G11B 20/00884 involving a watermark, i.e. a barely perceptible transformation of the original data which can nevertheless be recognised by an algorithm
• CPC Class Codes: H04L 2463/101 applying security measures for digital rights management data processing systems or methods, specially adapted for commerce, e.g. marketing, shopping, billing, auctions or e-commerce G06Q30/00
• CPC Class Codes: H04L 2463/102 applying security measure for e-commerce data processing systems or methods, specially adapted for e-commerce G06Q30/00
• CPC Class Codes: H04L 63/0428 wherein the data content is protected, e.g. by encrypting or encapsulating the payload
• CPC Class Codes: H04L 67/52 specially adapted for the location of the user terminal
• CPC Class Codes: H04L 69/04 Protocols for data compression, e.g. ROHC
• CPC Class Codes: H04L 69/329 in the application layer [OSI layer 7]
• CPC Class Codes: H04W 4/02 Services making use of location information

Abstract

A method and system for forming a data table in memory on an end user system. The data table forming a library index of storage locations to electronic digital content in memory. The method consists of retrieving an encrypted file from storage. The file has a beginning, an end and a trailer section located just prior to the end. The file is read from the end a predetermined distance to verify if an identifier is present. Reading and decrypting the trailer section from the file read. Determining if there are any updates in the trailer section. In the case there are no updates in the trailer section then decrypting the reference table containing one or more data table location indicators for data items with the first decrypting key. Next, decrypting one or data items with the first decrypting key. Populating the data table with data items at locations specified in the reference table.

Claims

1. A method for forming a data table stored in memory, the data table forming a library index of storage locations to electronic digital content, the method comprising the steps of:

decrypting at least a section of a file with a first decrypting key, wherein the first decrypting key is formed as a combination of a base key, a time-stamp, and an update number so as to uniquely correspond to both a given time and a given update in the section of the file;

determining if there are any updates in the section of the file to any data items that form a library index of storage locations to electronic digital content and if there are updates then performing the steps of;

decrypting, with the first decrypting key, a reference table containing one or more location indicators for storing the data items in a data table;

getting an offset to an update reference table;

decrypting the update reference table containing one or more location indicators for updates to the data items with the first decrypting key;

populating the data table with the data items at locations specified by the location indicators in the reference table; and

populating the data table with the updates to the data items at locations specified in the update reference table with the updates to the data items.

2. The method according to claim 1, wherein the step of populating the data table includes populating the data table in a tamper resistant environment.

3. The method according to claim 1, further comprising the steps of retrieving from a key database at least one of:

a base key;

a time-stamp; and

an update number.

9. The method according to claim 1, further comprising decrypting one or data items with the first decrypting key.

10. The method according to claim 1, further comprising decrypting the updates to the data items with the first decrypting key.

4. A computer readable medium containing programming instruction for forming a data table stored in memory, the data table forming a library index of storage locations to electronic digital content, the programming instructions comprising:

decrypting at least a section of a file with a first decrypting key, wherein the first decrypting key is formed as a combination of a base key, a time-stamp, and an update number so as to uniquely correspond to both a given time and a given update in the section of the file;

determining if there are any updates in the section of the file to any data items that form a library index of storage locations to electronic digital content and if there are updates then performing the steps of;

decrypting, with the first decrypting key, a reference table containing one or more location indicators for storing the data items in a data table;

getting an offset to an update reference table;

decrypting the update reference table containing one or more location indicators for updates to the data items with the first decrypting key;

populating the data table with the data items at locations specified by the location indicators in the reference table; and

populating the data table with the updates to the data items at locations specified in the update reference table with the updates to the data items.

5. The computer readable medium according to claim 4, wherein the programming instruction of populating the data table includes populating the data table in a tamper resistant environment.

6. The computer readable medium according to claim 4, further comprising the programming instruction of retrieving from a key database at least one of:

a base key;

a time-stamp; and

an update number.

11. The computer readable medium according to claim 4, further comprising decrypting one or data items with the first decrypting key.

7. An end user information processing system comprising:

a data table stored in memory, the data table forming a library index of storage locations to electronic digital content;

a first decrypting key for decrypting at least a section of a file, wherein the first decrypting key is formed as a combination of a base key, a time-stamp, and an update number so as to uniquely correspond to both a given time and a given update in the section of the file;

means for determining if there are any updates in the section of the file to one or more data items that form the library index of storage locations to electronic digital content and if there are updates then

decrypting, with the first decrypting key, a reference table containing one or more location indicators for storing the data items in a data table;

getting an offset to an update reference table;

decrypting the update reference table containing one or more location indicators for updates to the data items with the first decrypting key;

populating the data table with the data items at locations specified by the location indicators in the reference table; and

populating the data table with the updates to the data items at locations specified in the update reference table with the updates to the data items.

8. The end user information processing system according to claim 7, wherein the means for populating the data table includes populating the data table in a tamper resistant environment.

12. The end user information processing system according to claim 7, further comprising decrypting the updates to the data items with the first decrypting key.

13. The end user information processing system according to claim 12, further comprising decrypting the updates to the data items with the first decrypting key.