Abstract: What is provided is a computer-implemented method for protection of a program comprising a functional block, wherein the functional block is encrypted, additional code is added to the program and a protected program is thus generated, which is executable only in the presence of a predetermined license in a computer system which comprises a working memory, into which the protected program is loaded during execution, and a protection module for protection against unauthorized execution of the protected program, wherein, if the encrypted functional block is to be executed during execution of the protected program, the additional code is executed and, if a license is present, said additional code, together with the protection module, a) causes decryption of the functional block such that the functional block is present in the working memory of the computer system in decrypted form; b) allows execution of the decrypted functional block, and c) upon completion of execution of the decrypted functional block, causes

Abstract: A method of operating a computer system on which an application is installed comprises the steps of: verifying whether a predetermined run authorization for the application is present, and, in the absence of said predetermined run authorization, decreasing the speed of execution of the application on the computer system as compared to the speed of execution of the application in the presence of the predetermined run authorization.