When i did my course in MultiMedia (finished this year) we had to sign a thing at the begining of the year stating that we gave permission for QANTM (the company we did the course through) to use any of our works for advertising/educational purposes.

I'm pretty sure if you haven't signed something similar then the uni can't do squat with your work as it would go against Intelectual Copyright. Check up on copyright law for the country/state you reside/study and find out.

You may want to even go to where people are studying law and ask them, they should have a good understanding of it all.