I too wish there was an easier way to distinguish this.

One of my weekend projects involved stripping actor, genre, and director information from IMDB for the AFI Top 100 movies. The prototype was simplistic but still gave some interesting data to mine (e.g. Robert Duvall has been in the most AFI Top 100 films, credited 6 times).

The next step of the project would be to strip more data from IMDB, but I hesitated since I didn't want to get my IP banned or something. I had never considered that what I was doing could potentially be illegal.