It appears as if Brian Atkins <email@example.com> wrote:
|The technique is that DoubleClick pays the adult site to put a 1x1 pixel
|invisible graphic on their site. When your browser hits the site, it also
|loads the graphic which is served from DoubleClick's servers so your browser
|also sends your DoubleClick cookie (you do have one, don't you?) to them
|along with a referrer URL in the HTTP request that DoubleClick can then use
|to know what site you are at currently.
A peson who have access to the local machine's host definitions can define
the local machine as doubleclick.ad.net (or whatever the name of their host)
and have a small web server which simply returns a one-pixel picture for
everything asked from from it. The client will ask this server instead of
DoubleClick's server, and they recieve no information from this host.
"This is Information Retrieval, not Information Disposal."
--from the film Brazil
This archive was generated by hypermail 2b29 : Mon Oct 02 2000 - 17:33:49 MDT