A system for management of access rights to operating data and/or control data of buildings or building complexes can include a communications release service running on a first server. This release service releases a communication of a user, who is registered with an identity, with the buildings or building complexes filed for him or her in a list when his or her identity corresponds with an identity filed in the list. Also, after release of the communication has taken place by the communications release service, a building authorization service running on a second server releases specific access rights for the user to operating data and/or control data of the building or building complex on the basis of access rights filed in an authorization databank.