For students enrolled in a university course, LTI brings them to a courselet without any additional login or enrolment steps

If you are teaching a university course, LTI provides the most transparent way of giving your students access to a courselet:

To set this up, you should

Note that the LTI URL can ONLY be used in a Course Management System that supports LTI.  In particular, you can't simply email an LTI URL to students.