Each provider uses a number of licensing models, some will be on an unlimited basis, so that all students on a given module could look up and read the required material at once. Some titles are restricted to 1 or 3 students at the same time where, access is time limited in a similar way to borrowing a physical text from the library. If the title times out, it can simply be re-borrowed, provided there is no queue ahead of you. Where possible we strive to get the unlimited licenses as a priority.