If they must sign an AUP before downloading, you can terminate their access if they were discovered violating it.
If the information is clearly copyrighted, and they republish it, you can sue them, and maybe even get them nailed on criminal charges.
One technique for winning a court battle on that is to include a few "ringers" in the listings: a fake listing which looks like all the others, but doesn't derive from publicly available data. If you see a published list somewhere else that includes your ringer, there's your legal trigger.
The term "ringer" comes from phone lists that were leased in the old days: a few of the phone numbers "ring" into the list-owners inner office, so the owners knew how many times a list was being used, and by whom. Every public white page and yellow page book has a few ringers in it, for example, just so the phone book publishers can see who and how the data is reused. I know of a few corporate phone books that had a few ringers as well: a number listed in the book rang into corporate security instead, and was always summarily dealt with.
-- Randal L. Schwartz, Perl hacker
Be sure to read my standard disclaimer if this is a reply.
In reply to •Re: State-of-the-art in Harvester Blocking
by merlyn
in thread State-of-the-art in Harvester Blocking
by sgifford
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