After detecting this site's robot stealing valuable resources (Dr. Tong's Seminary Lectures) from my site, I have created a ban script in /usr/bin using iptables to ban Metadata Labs from my server.
My resources are free, but those that are password protected are for those who are interested in the pertaining subjects, not for you to leech and build your own database.
But this is not the point of course, there are plenty of methods to steal data. However, it is a motivation for me to start banning IPs from my server, for security reasons such as hackers, crackers, etc. There had been IPs which I wished to ban stealing my audio files, but it was too minor for me to be eager enough to pursue this subject. I failed to realize the importance of having an easy way to ban an IP until now.
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