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Before doing more work on signed P3P policies, we need to discuss whether there is really a compelling reason to do this.
The WG discussed this and decided that we don't currently see a compelling reason to pursue this. http://www.w3.org/TR/xmldsig-p3p-profile/ already explains how digital signatures can be used in P3P. There might be some advantages to further standardization if there was a seal provider or other organization prepared to actually make use of this. However, until potential users come forward, there does not appear to be a need for further work on this.