I think you have to take into consideration the TOS, copyright and also robots.txt. If you ignore these then its well within the site owners rights to do someth

I think you have to take into consideration the TOS, copyright and also robots.txt. If you ignore these then its well within the site owners rights to do something about it - blocking you or further. We always look at the robots.txt file first and use that as our benchmark in terms of what they (the site) wish robots/crawlers to look at