| 摘要 |
A method for supervising and controlling the information transfer between two or more categories of users of a data network with closed user groups. Users, belonging to a first category of users, constitute, together with a number of users belonging to other categories, a special closed user group. Within this group, the users belonging to the first category are given a certain first identity, whilst users, belonging to other categories of users, are given a certain second identity, different from the first identity. Transfer of information is only allowed firstly between users with the first identity and users with the second identity and secondly between users who belong to the same closed user group.
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