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I don't think this is really true? most schools I'm familiar with are "open campuses". the public is free to walk around campus, visit the library, etc. during

I don't think this is really true? most schools I'm familiar with are "open campuses". the public is free to walk around campus, visit the library, etc. during normal hours. restricted areas like dorms and labs with expensive equipment will be locked. as an outsider, I wouldn't try to sit in on a six person seminar without talking to the professor, but I'm sure no one would notice or care if you sat in on a few large lectures.

IshKebab 5y ago
It used to be true, 20 years ago. It hasn't really been true for at least a decade. RFID access control is really cheap and basically all buildings have it now. You could of course tailgate someone but that's crossing a line you probably don't want to cross. I'm not sure why you'd bother though for computer science. There are plenty of very high quality lectures online.