Adventures in Nannyware

As I have a Mac laptop, the first thing that comes up is the apple start page when I log onto the research institute's internet. Upon doing so, I noticed in one of the sidebars an advertisement for the re-mastered Star Trek, The Original Series. Of course, being a Star Trek fan, I click on it.

The institute blocks me and gives me the standard warning message upon blocking me.

Could someone please tell me what is so dangerous or naughty about accessing Star Trek????