Unless someone takes steps to disable the security strip
Heh. Some of the books I've got checked out for my diss. haven't been looked at for so long that I had to bring them to the circulation desk to get ID strips and security strips installed - all they had was the old punch-card slots in the back. And some didn't even have that!
On that note: largely ignored and unused books are EVERYWHERE in a large University's library system. In my University, it's the 1st floor (you enter on the 4th) where the dissertations and theses are stored. No one ever goes down there, unless it's undergrads looking for some privacy to... you know. Some of the old published series (like the Victoria County Histories, or other series of books published over several years/decades by various small presses) don't get individually catalogued and are rarely referenced, much less checked out. It's easy to lose a book in the system that way.
So I'm basically wondering if it's common to have a section that's generally viewed as restricted access but not actually restricted access? And for the restricted section, how does one get access to this section?
There are three types of "restricted" access at my university. The first is special collections - the 1000-year-old book, the book autographed by Pres. Thomas Jefferson, etc. Those you have to have IDs, references, etc. and are insanely closely monitored when you access. Restrictions vary by library (PM me if you want details) but in general you will not be allowed to have anything with you but a laptop, paper and a pencil when you consult these documents.
The second is what I think you mean by restricted access - books that aren't on the circulating shelves because hardly anyone uses them. Library staff have to fetch these books, which may take hours or days depending whether they are on-site or not. But they can usually be checked out just fine.
The third is books that can't be checked out of the library - reference books, usually, but also books on reserve for a course. They're usually in their own sections of the library.
A good point to remember is that most universities have multiple libraries, some of which cater to undergrads and some of which cater to other groups within the university. My U's health-science library is a pain in the *** because it insists on treating all of its books like a special collection, even if they're books you can order on amazon for $10. My U's math library is interesting because it's very small, housed in the math department, and only open for 2 hours a day, a few days a week. Math faculty and grad students have a key to the library and can access it at any time (and run off with books without checking them out, but it's honor code). We actually used to take students down to the library to do make-up tests. It's pretty lonely/quiet down there.