US5838790 Патенты
A System and method for authenticating that advertisements are properly displayed at a remote computer. The advertise ments are received electronically and are Stored in a memory device at the remote computer. The advertisements are output to users when the remote computer is off-line. Each advertisement is authenticated by the remote computer prior to output to ensure, for example, that the advertisement has not been tampered with, modified or replaced. Information as to when advertisements are output is recorded and used for billing the advertisers. This information can be stored in a Statis
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