Abstract: An object recognition determination produced by a perception system from data received from a ranging sensor system can be verified. A certificate can be produced that includes data for points of readings from the ranging sensor system. The points can have been segmented, by the perception system, into point sets that correspond to objects in an environment of a cyber-physical system. The certificate can also include lists of pairs of points in a point set and a velocity of the point set. A test of information in the certificate can be performed. Based on a result of the test: a rectification can be made to the perception system or the ranging sensor system or a communication can be transmitted to a control signal production module configured to produce, in response to the communication, a control signal to be transmitted to an actuator system configured to control the cyber-physical system.

Abstract: A system controls access to a group of media items. A client device is operable by a user. A media server is coupled to at least one media data source, wherein the at least one media data source stores one or more media items for supply, by the media server, to the client device over a network. An authorization server is coupled to an authorization data source. The authorization data source stores data identifying a group of media items of fixed group size N that are accessible by the user, each media item in said group having a different associated availability parameter value indicating a number of time periods M within which access to the media item is available, wherein the authorization server is arranged to authorize the media server to supply a media item to the client device if said media item belongs to the group of media items.

Abstract: A system controls access to a group of media items. A client device is operable by a user. A media server is coupled to at least one media data source, wherein the at least one media data source stores one or more media items for supply, by the media server, to the client device over a network. An authorization server is coupled to an authorization data source. The authorization data source stores data identifying a group of media items of fixed group size N that are accessible by the user, each media item in said group having a different associated availability parameter value indicating a number of time periods M within which access to the media item is available, wherein the authorization server is arranged to authorize the media server to supply a media item to the client device if said media item belongs to the group of media items.