Method and apparatus for enabling trial period use of software products: Method and apparatus for utilizing a decryption block
First Claim
1. A method in a data processing system of securing access to particular files which are stored in a computer-accessible memory media, comprising the method steps of:
- providing a file management program as an operating system component of said data processing system;
storing a plurality of files including at least one encrypted file and at least one unencrypted file in said computer-accessible memory media;
for each of said at least one encrypted file;
(a) recording in said computer-accessible memory media a preselected portion of said at least one encrypted file;
(b) generating a decryption block which includes information which can be utilized to decrypt said at least one encrypted file;
(c) inserting said decryption block in said at least one encrypted file in the place of said preselected portion;
utilizing said file management program to (a) monitor data processing system calls for a called file stored in said computer-accessible memory media, and (b) determine whether said called file has an inserted decryption block, and (c) process said called file in one manner if said called file has an inserted decryption block, and process said called file in a different manner if said called file does not have an inserted decryption block.
1 Assignment
0 Petitions
Accused Products
Abstract
A method and apparatus is provided in a data processing system for securing access to particular files which are stored in a computer-accessible memory media. A file management program is provided as an operating system component of the data processing system. A plurality of files are stored in a computer-accessible memory media, including at least one encrypted file and at least one unencrypted file. For each encrypted file, a preselected portion of the file is recorded in memory, a decryption block is generated which includes information which can be utilized to decrypt the file, and the decryption block is incorporated in the file in lieu of the preselected portion which has been recorded in memory. Then, a file management program is utilized to monitor data processing system calls for files stored in the computer-accessible memory media. The file management program determines whether the called file has an associated decryption block. The called file is processed in a particular manner dependent upon whether or not the called file has an associated decryption block.
276 Citations
8 Claims
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1. A method in a data processing system of securing access to particular files which are stored in a computer-accessible memory media, comprising the method steps of:
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providing a file management program as an operating system component of said data processing system; storing a plurality of files including at least one encrypted file and at least one unencrypted file in said computer-accessible memory media; for each of said at least one encrypted file; (a) recording in said computer-accessible memory media a preselected portion of said at least one encrypted file; (b) generating a decryption block which includes information which can be utilized to decrypt said at least one encrypted file; (c) inserting said decryption block in said at least one encrypted file in the place of said preselected portion; utilizing said file management program to (a) monitor data processing system calls for a called file stored in said computer-accessible memory media, and (b) determine whether said called file has an inserted decryption block, and (c) process said called file in one manner if said called file has an inserted decryption block, and process said called file in a different manner if said called file does not have an inserted decryption block. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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Specification