Privacy Bird® keeps a record of the privacy policies at sites users visit. This reduces the need to repeatedly refetch the same policy every time a user returns to a site. Policies are removed from this policy cache after they expire, or when the user clears the cache. To clear the cache, click on the bird icon and select Clear Cache. This is especially useful for web site developers who are testing the P3P policies on their sites.

Note that by default policies expire after 24 hours unless the site has indicated that they can be used for a period longer than that. When a policy expires, it cannot be applied to new visits to the web site. However, it still applies to any data collected while the policy was valid.