The libraries at Lund university have two types of books: course books (marked in LUBcat and on the edge of the book) and regular loans.
Course books are books used on running courses, and therefore has a shorter borrowing time (because they are used more frequently).
Regular loans are all other books that belong to the libraries at Lund university.
Just because a book is on the literature list of a course does not mean it is a "course book" accourding to the library: the books that are registered as course books are the ones that are frequently borrowed by a large number of people every year.
The signature "course book" in the library catalogue LUBcat only means that the book has a significantly shorter borrowing time.