Restriction of communication service accessibility among subscriber communities
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United States of America Patent
Stats
-
May 21, 1991
Grant Date -
N/A
app pub date -
Dec 30, 1988
filing date -
Dec 30, 1988
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
Subscribers (100-108) of an electronic mail system (1-2) service are divided into a plurality of subscriber communities (30-34). Subscribers in each community have common rights of access to one or more communication service--the sending and receiving of mail messages--which rights are generally different from those of subscribers in other communities. Permissions to send and receive messages between any two communities are specified on each mail system in a permissions matrix (40), wherein each row (41) represents a different sender community, each column (42) represents a different recipient community, and the value stored at their intersection (43) indicates the permission vis-a-vis the two communities. A function (50) is invoked on the sender's mail system (1,2) at message addressing, and on the sender's and recipients' mail systems (1,2) at message delivery, to enable or prevent (FIG. 3) message sending or delivery according to the matrix-specified permissions. Optionally, a message-associated permission (410) may be used to override matrix-specified permissions.
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