leakage risk application_number US 201113173491 A description fig1 shows an overall configuration of a system in which a method according to an embodiment of the invention is implemented the method according to an embodiment of the invention is implemented by utilizing a framework a virtual execution framework 10 that is based on virtual machines or vms virtual machines arc known in the art and are described in detail for example in shamon a system for distributed mandatory access control by jonathan m mccune trent jaeger stefan berger ramon caceres and reiner sailer an will not be described further herein the virtual execution framework 10 is a kind of computer and serves as a calculation framework of a third party institution having a memory space 100 under control of the framework 10 multiple computers including a computer a 20 and a computer b 30 independently upload data and or modules to the memory space 100 or download data and or modules programs or program codes for execution by computers from the memory space 100 the computers also upload data from the memory space 100 to an external storage 400 or download data from the external storage 400 to the memory space 100 independently or in cooperation with each another for example the computer a 20 can represent a computer managed by one financial institution and.