| 摘要 |
A web browser plug-in tool is used to read or construct a unique identifier for a computing device. The tool is programmed to read or construct the identifier from one or more Microsoft ® Windows ® Management Instrumentation (WMI) sources for example: ComputerSystemProduct.UUID, ComputerSystemProduct.IdentifyingNumber and BaseBoard.Product and to provide the identifier to a remote digital media service. Preferably, the identifier is stored both in the device and on a server for the service against a record associated with the device. A further unique identifier, generated by the service, may also be stored in the browser or browser plug-in; preferably as a Flash ® Shared Object but perhaps as a cookie or in browser local storage. The unique identifier is typically used to determine whether or not a trial period for the service has been utilised on the computing device. Also disclosed is a method in which only a unique identifier, generated by a remote digital media service, is stored in the web browser or browser plug-in.
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