Can P3P address different policies for the same server or one policy for multiple servers?
By it’s policy-reference-file, by defining “realms” in the header of the answer, servers can not only define different policies on the same server, but also a same policy for different servers. To define different policies on the same server can be useful, when there are pages, that can be browsed and where the service doesn’t collect any data and other pages for shopping or feedback, where data is collected and a certain purpose would be addressed. One could also imagine, that in parts of the server the purpose of data collection is different from another part. All this can be addressed. If there is huge service with different servers where only one policy applies, this can also be addressed by the reference-mechanism provided by P3P 1.0. For more detail, see the reference-section in the P3P-Specification.
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