A method of reading out access authorizations or ID's from at least one customer medium by at least one reader (3, 4, 5) of an access control device (2) and evaluating the selected ID's or access authorizations. All readers are activated and perform a scan for ID's or access authorizations, which can be contained or stored in at least one customer medium. The selected ID's or access authorizations are transmitted to a controller which temporarily stores and transmits them to an evaluation unit (1) while the readers continue to scan for possible ID's or access authorizations. If an evaluation in the evaluation unit finds that a selected access authorization is valid or allocated to a selected ID, the readers are deactivated, and access is granted. If, after a prescribed time, no further ID's or access authorizations are read out, transmitted and recognized as valid, then access is denied.