A method for preventing unauthorised use of electronic access authorizations that can be managed in mobile electronic devices by means of a wallet application, which are transferred to the mobile electronic devices from a server by means of a link for downloading the respective access authorization, wherein an electronic access authorization is acquired by means of an interaction with the server, wherein during the purchase of the electronic access authorization a password or authentication data and a mobile electronic device, to which the electronic access authorization is transferred from the server by means of a link for downloading the access authorization, is indicated by a purchaser, wherein a unique ID of the mobile electronic device is transferred to the server during the execution of the link for downloading the acquired access authorization, said unique device ID being associated with an ID of the acquired access authorization, wherein a transfer of the electronic access authorization from the mobile electronic device to another mobile electronic device is only executed after the input by means of an interaction with the server of the password indicated by the purchaser of the access authorization and/or of the authentication data indicated by the purchaser of the access authorization, wherein, upon the completed transfer, the access authorization ID is associated with the ID of the other mobile electronic device in the server and the access authorization on file for the electronic mobile device is marked invalid by the server, wherein, after the completed transfer to the mobile electronic device of the link for downloading the access authorization, the wallet application installed on the mobile device executes the link and transfers a unique ID of the mobile electronic device to the server for downloading the acquired access authorization, wherein the server reviews whether an ID of the acquired access authorization is associated with the transferred unique ID of the mobile electronic device, wherein, if this is not the case, the access authorization ID and the unique ID of the mobile electronic device are associated with each other and the electronic access authorization subsequently is downloaded and wherein, if an electronic access authorization is intended to be transferred from a mobile electronic device to another mobile electronic device, the wallet application of the mobile electronic device, whose unique ID is associated with the access authorization ID, transfers a link for downloading the access authorization to the other mobile electronic device after an initiation of this process by the owner of the mobile electronic device, whose unique ID is associated with the access authorization ID, wherein the wallet application of the other mobile electronic device executes the link and transfers a unique ID of the other mobile electronic device to the server, wherein the server subsequently reviews whether an association is in place between the ID of the access authorization to be transferred and a unique ID of another mobile electronic device, wherein, if this is the case, the server transfers a link to the other mobile electronic device, the execution of said link resulting in an input screen provided by the wallet application for entering the password indicated by the purchaser of the access authorization and/or the authentication data indicated by the purchaser of the access authorization, wherein, upon entry of a valid password or valid authentication data, the access authorization ID is associated with the unique ID of the other mobile electronic device in the server and the electronic access authorization is downloaded to the other electronic device and the access authorization filed on the mobile electronic device is marked invalid, wherein the association of the unique ID of the mobile electronic device with the electronic access authorization is deleted and the respective data are stored in the server.