Abstract: Integrity checking of a software module to be used in a mobile communication terminal (101) is illustrated. The terminal (101) is capable of communicating in a mobile communication system (100) and the software module is stored on a removable memory unit (103) connected to the terminal (101). The terminal (101) communicates via the mobile communication system (100) with the software provider (125). During the communication a digitally signed data block comprising a reference value for use during integrity checking of said software module is received.

Abstract: The present invention relates to a method and system for testing programs. In the method, authorization to use is determined for a program. In the method, a grant message of authorization is produced to grant temporally restricted authorization to use for the program, it is verified that the grant message of authorization is suitable to be utilized only in the device and the verified grant message of authorization is transmitted to the device. In the device the verification is checked, the authorization to use transmitted in the grant message of authorization is determined, and authorization to use according to the grant message of authorization are given for the program to be tested, if the checking shows that the grant message of authorization is intended for the device. The invention also relates to a device in which the method is applied.