Depending on what you want to share with students, and how much of it, Fair Use might come into play. In the United States, "copyright rights are limited by the doctrine of Fair Use, under which certain uses of copyrighted material for, but not limited to, criticism, commentary, news reporting, teaching, scholarship, or research may be considered fair."
Just because something is being used for teaching or scholarship does mean it falls into the fair use category. There are four factors that are considered when determining fair use:
- the purpose and character of the use, including whether such use is of a commercial nature or is for nonprofit educational purposes;
- the nature of the copyrighted work;
- the amount and substantiality of the portion used in relation to the copyrighted work as a whole; and
- the effect of the use upon the potential market for or value of the copyrighted work.
The UML Library's Copyright and Fair Use page has additional information and guidance on this topic.