It surprises me that there seems to be a general lack of knowledge regarding copyright law. We all use images and other material from the web, but do you know the rules? It seems that only university staff really know what the deal is.
When using websites, not being able to find a copyright sign or policy does not mean that there is no copyright. Any published original material automatically acquires copyright statues ecause it has been published. In short unless a website says you can use its content, you can't without secific permission from the author/creator.
Check out the CLA for more details
Copyright Licensing Agency (CLA) : Home Page
Any other help please post below.