It may not be legal to scan and post an article even in BlackBoard. Instead, create a persistent link to an article accessible through one of the LTU Library's subscriptions. (Harvard Business Review, available through Business Source Complete, does NOT allow posting a link.)
If the library does not have access to a particular article:
To the question "Can I post an article on BlackBoard?" the answer is, "It depends...." Fair Use guidelines will help you determine if the proposed activity falls within copyright fair use. These tools are similar; choose the one that works best for you. It is up to the individual instructor to evaluate the balance. If you are teaching an online course, be sure to consider the TEACH Act as well.
Most scholars and educators agree that copyright law is a confusing quagmire. Below are links that may help you sort it out.
Copyright Law in the United States from the United States Government copyright website.
Copyright Law in the United States from BitLaw website created by copyright attorney Daniel Tysver, a partner with the Minneapolis patent law firm of Beck & Tysver.
Copyright and Fair Use website from Stanford University.
Copyright Term and the Public Domain in the United States from Cornell University
The Copyright Crash Course from the University of Texas
Online course in Copyright law from MIT Professor Keith Winstein.
Tales from the Public Domain: Bound by Law? a comic book from scholars at the Duke University Law School's Center for the Study of the Public Domain. Read a digital version of the book or buy a paper copy.
There have been questions regarding the ownership of videos created by students and posted online, particularly on YouTube. Like everything else related to copyright issues, "it depends". Your work is automatically copyright protected when it is created but the agreements you sign or "click through" may extend many of those rights to the host of your work.
It really is worth reading the YouTube agreement. It looks like you retain ownership rights but you also give YouTube the rights to do almost anything with the video.
Below are some links that should give you some insights.