Originally Posted by ULVideo

I understand why you might find watermarking the content to be an issue, but how else can they protect their interests?

Also, since you've got so many people with dynamic IP's, I'm not sure tracking by IP is a viable option (both in terms of you still losing signups when the surfer's IP changes, and in terms of them having to credit slaes to a webmaster who didn't send the srufer simply because a new surfer visited on an IP where some other surfer had visited from before)