A method of delivering content from a content delivery system to a user's terminal over a communication link that provides users with flexibility in determining how to pay for content, one option being to receive targeted advertising with the content. Other options presented to the user involve various methods of paying for limited or unlimited access to the content. Therefore, the status in terms of whether access is free for each available content item relative to each user is tracked using a tracking database.

 
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> Verifiable, secret shuffles of encrypted data, such as elgamal encrypted data for secure multi-authority elections

> Web-based medical diagnostic and training system

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