Abstract: There is disclosed a system and method of extending the labels on an encryption technique so that different users can utilize the same files under different rights established by both the user and the system administrator. This system and method take advantage of an extension of the file label which contains configuration capabilities and user rights and privileges to that file. The extended labeling is expandable so that several users can each be identified having specific rights and specific encryption capability with respect to the file.

Abstract: An imaging processing system (10) for displaying a succession of selected separated images of a moving object (62, 64) moving in an otherwise substantially static scene includes an image sensor (12) for generating video signals of the static scene and for generating video signals of the static scene including the object (62, 64) moving therethrough. The video signals are generated over a plurality of frames (80-94). A first memory (104) stores the video signals of at least one of the plurality of frames from the static scene. A second memory (104) stores the video signals of the plurality of frames from the static scene including the object (62, 64) moving therethrough. Structure (106) is provided for comparing on a frame-by-frame basis the video signals stored in the first memory (104) with the video signals stored in the second memory (104) to thereby determine the presence of the object (62, 64) in each of the plurality of frames (80-90).

Abstract: A method of cryptographically labeling electronically stored data is provided as part of a security system for personal computers. In protecting sensitive files of data, the labeling method utilizes a plurality of key streams, which are long, relatively prime-length sequences of random-like bytes. The key streams are related in some way to individual user and machine identifiers. Protected files of data are encrypted and decrypted by combining the key streams with the data using a reversible function, such as Exclusive OR. Each protected file has a label prefixed to it as part of the file. The label contains information necessary for encrypting and decrypting the file, controlling access to the file, and verifying integrity of the label and file. The label is permanently prefixed to the protected file but is encrypted and decrypted separately from encryption and decryption of the file.