VALIDITY CHECK OF A LICENSE OF A MAINTENANCE UNIT FOR ACCESSING A CONTROLLER OF A PASSENGER TRANSPORTATION/ACCESS DEVICE OF A BUILDING

摘要

The invention allows checking the validity of a license of a maintenance unit for accessing a controller of a passenger transportation/access device of a building, without a need for an online connection to a service center or the like. An expiration time of the license is read from an encrypted license file stored in the maintenance unit in response to detecting the maintenance unit being connected to the controller. A manufacturing time and a current usage time of the controller, both stored in a secure memory of the controller, are read. A total of the manufacturing time and the current usage time of the controller are compared to the expiration time of the license. In response to the total not exceeding the expiration time, the license is determined to be valid.

主权项

1. A method of checking the validity of a license of a maintenance unit for accessing a controller of a passenger transportation/access device of a building, wherein the method comprising:
reading a preset expiration time of the license for accessing the controller from an encrypted license file stored in the maintenance unit in response to detecting the maintenance unit being connected to the controller; reading a preset manufacturing time of the controller and a current usage time of the controller stored in a secure memory of the controller, the usage time being a counter value incremented only while the controller is powered on; comparing a total of the manufacturing time and the current usage time of the controller to the expiration time of the license; and determining the license to be valid in response to the total of the manufacturing time and the current usage time of the controller not exceeding the expiration time of the license.