> What are some methods for persistant user tracking?
>
> I need to limit the number of times a person can  search for certain
material without forcing them to create a login.
>
> Currently I am using cookies to limit the number of searches a person can
do  but, quiting and removing the cookie
> file easily defeats that.  Storing their IP address locally would work but
then not everyone has a static ip. Would
> grabbing the MAC from their ethernet card be doable? Again alot of people
use modems.
>
> Any thoughts or resources you know of?

Othere than logging in, which you seem to want to avoid for the first N
searches, there doesn't seem to be much more you can do.

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