I checked out the PICS format for a bit, and it seems to me that ICRA is (basically) a high-level implementation of PICS guidelines which seems to only make use of the third-best method. (the meta tag method)
Best method according to the specs is for the server to send the headers with each request. This would seem to be the simplest solution for Adult servers to use, wouldnt it?
cd34 or some server guru should check out that link, as I'm pretty sure Apache could probably be set up to send those headers for every single request sent to a server.
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