This is supported by the P3P protocol. This language can be used to express a person's preferences. Thus, it will soon be possible to automatically inform users about a Web site's privacy policy. This basic implementation would allow a user to automatically obtain Web sites' privacy policies, automatically evaluate and check these policies against his personal preferences, and receive assistance during online transactions such as computer-issued warnings or recommendations, or allow the computer to finish the transaction on behalf of his. Now, in real life there is more to business transactions than just saying yes or no and providing information.
People negotiate contracts with special terms and conditions.
Assume you could use a system that can automatically obtain Web sites' privacy policies and check and evaluate them against your personal needs and preferences. The two most common answers were, to only give out the minimum set of information that is needed for the transaction and to only accept a transaction if the Web site promises not to resell the user's information. Otherwise, the system should abort the transaction or warn the user. In addition to this, an OPA would be able to keep track of online transactions and their respective terms and conditions. The users of an OPA can benefit from it in multiple ways.