Abstract: The invention concerns a process to protect a vulnerable software working on a data processing system against its unauthorized usage using a processing and memorizing unit. The process comprises defining: 1) a set of dependent functions whose dependent functions are liable to be executed in a processing and memorizing unit 2) a set of triggering commands, said triggering commands being liable to be executed in the data processing system and to trigger the execution in a processing and memorizing unit, of the dependent functions 3) for each triggering command, an order 4) a method of renaming of the orders 5) restoring means designed to be implemented in a processing and memorizing unit during a usage phase, and enabling to restore the dependent function to execute, from the renamed order.

Abstract: The invention concerns a process to protect a vulnerable software working on a data processing system against its unauthorized usage using a processing and memorizing unit. The process comprises creating a protected software by choosing in the source of the vulnerable software at least one conditional branch and by producing the source of the protected software so that during the execution of the protected software a second execution part, executed in the processing and memorizing unit, executes at least the functionality of the chosen conditional branch and puts at the data processing system's disposal a piece of information enabling it to know where to carry on the execution of the software.

Abstract: The invention concerns a process to protect a vulnerable software working on a data processing system against its unauthorized usage using a processing and memorizing unit. The process comprises defining: 1) a set of elementary functions whose elementary functions are liable to be executed in a processing and memorizing unit 2) a set of elementary commands, said elementary commands being liable to be executed in the data processing system and to trigger the execution in a processing and memorizing unit, of the elementary functions 3) exploitation means designed to be used in a processing and memorizing unit during a usage phase, and enabling to execute the elementary functions of said set.