The Digital Millennium Copyright Act of 1998 (Chapter 12, Sections 1201 and 1202)
Title 1 of the DMCA covers anti-circumvention and technological protection measures (TPM) that protect digital intellectual property.
By law it is illegal to circumvent or decrypt these protections, even if Fair Use permits your intended use. It is also illegal to manufacture and to traffic any technology or service that is designed to circumvent a TPM. (Section 1201)
The DMCA also prohibits removing the copyright management information contained on a copyrighted work.(Section1202)
When acting as a service provider, the University must abide by the legal requirements of the DMCA. The DMCA stipulates that:
"On receipt of an acceptably complete claim of infringement, DMCA (512) (g) requires [the university] to direct prompt removal of material or removal of all local or wide-area network access to the material or activity claimed to be infringing."
Whether the claim is accurate or not, the alleged infringing material will be taken down. The infringer has recourse to file a counter claim.
Generally, it is illegal to circumvent TPMs on audiovisual works to create compilations of clips. You must scroll or scan to the section of the video you wish to show
There is no definition of "short portions." See the 2009 Rulemaking on Exemptions from Prohibition of Technological Measures that Control Access to Copyrighted Works for more information.