Abstract: A method (300) for metering usage of software products in a data processing system is proposed. The products to be metered are identified in a global catalogue (325) by means of multiple attributes of a corresponding executable module (340); the verification of these attributes requires accessing the module through its path, which is not available at run-time (being the module directly identified by a corresponding location for performance reasons) . The solution is based on the idea of creating a local catalogue (350) that associates the path of each module installed on the system (that is included in the global catalogue) with its location. The locations of the running modules are detected (365) periodically from a list of processes in execution on the system. In this way, it is possible to obtain (355) the path corresponding to the location of each running module in a very fast way trough the local catalogue (without any scanning of the system).