Interesting reading over @ http://www.benedict.com/info/info.aspx regarding copyright. It really does open your eyes to what you can and cant do.
But regarding this site, i have not used any images and words that contravene copyright.
Regarding using the Curtin logo for an assignment
according to the Curtin website:
Unless otherwise stated, the material published within the Curtin website is Curtin copyright.
no part of this site may be reproduced, in whole or in part, without the specific written permission of Curtin first-hand and obtained.
So in other words for me to be able to use Curtins logo for an assignment i would get permission from them first. Just to be on the safe side of things :)