Abstract: A method is provided to match an unknown data point with a known data point contained in a multi-dimensional data structure. The method may include receiving data from any multi-dimensional source where a query may be used to locate specific data points within that source. The method receives a number of inputs, including a Euclidean error distance and a number of reference points to use. Furthermore, the method determines optimal reference points to locate a relatively small number of data points within the data structure that possibly match the unknown point. Once possible match points are located, the method then determines the unknown point's match.

Abstract: Systems and methodologies are provided for a Digital Rights Management (DRM) that permits a service provider implementing DRM (the Service), to distribute and use digital contents to a plurality of devices designated by a user, via employing a registration component and a DRM component. The registration component can associate a user with a particular device among the plurality of devices, and also associate the device with its DRM challenge. The DRM component can issue licenses for content(s) used on the particular device. Such an arrangement facilitates users' ability to roam and use a digital content purchased across a number of devices designated by the user and approved by the Service.

Abstract: A globally relevant playlist presented. A globally relevant playlist includes track references corresponding to a plurality of tracks. Each track reference includes a global track identifier that uniquely identifies the corresponding referenced track among any number of computers or computing devices. A method for playing tracks according to a globally relevant playlist is presented. A track referenced in the playlist is selected. It is determined whether the track is locally accessible according to the global track identifier. If the track is accessible, it is played. If the track is not locally accessible, the track is retrieved from a track source associated with the track and according to the global track identifier. A method for downloading tracks to a player device according to a globally relevant playlist is also presented.