Abstract: There is provided a combination of software components forming a dynamic, “smart” system for limiting access to inappropriate content available in a public computer or communications network such as the WWW. An access control mechanism having a variable sensitivity is originally set to a nominal sensitivity but may relax if the user does not attempt to access inappropriate material. If, however, a user attempts to access inappropriate material, the sensitivity of the filter is adjusted to a more restrictive sensitivity. Attempts to access inappropriate material are recorded and a temporal map is formed. Statistical analysis is performed, based on the temporal map, to predict future patterns of access attempts by a user. The sensitivity of the access control mechanism is raised and relaxed based upon a user's pattern of attempts to access inappropriate material.

Abstract: A shutter is disclosed having a shutter blade frame comprised of two spaced apart rails, each rail incorporating at least one magnet section. Individual pairs of electromagnets are positioned for movement along the rails. At least one shutter blade, having an opening defined thereby, is connected to a pair of electromagnets for movement along the rails from a rest position to an open position. Application of current to the electromagnets causes the at least one shutter blade to travel along the rails causing an alignment of the defined opening with a selected light path to cause an exposure generally of an image sensor such as film. Springs are positioned on the shutter frame for urging the at least one shutter blade to the rest position.