A system and method are disclosed by which, in one embodiment, a user of a user terminal may select or be subject to one or more imposed limitations on their activities over a period of time. The commitment and data corresponding to an identifying biometric feature of the user are stored. When the user uses a user terminal the system and method compares a capture biometrical image of the user with the stored image and if there is a match the one or more limitations is/are enforced. Biometrical data for files where the temporal period of the limitation has passed are ignored to reduce the number of files with which the comparison must be made reducing the number of false matches.