04135240 is referenced by 129 patents and cites 12 patents.

An improved arrangement for controlling access to data files by computer users. Access permission bits are used in the prior art to separately indicate permissions for the file owner and nonowners to read, write and execute the file contents. An additional access control bit is added to each executable file. When this bit is set to one, the identification of the current user is changed to that of the owner of the executable file. The program in the executable file then has access to all data files owned by the same owner. This change is temporary, the proper identification being restored when the program is terminated.

Title
Protection of data file contents
Application Number
5/377591
Publication Number
4135240
Application Date
July 9, 1973
Publication Date
January 16, 1979
Inventor
Dennis M Ritchie
Summit
NJ, US
Agent
Stephen J Phillips
Assignee
Bell Telephone Laboratories Incorporated
NJ, US
IPC
G06F 13/00
G06F 11/10
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