There is a box marked Usage Rights, which permits you to search for content that is
* free to use, share or modify, even commercially
* free to use, share or modify,
* free to use or share, even commercially
* free to use or share
* not filtered by licence
So if a page is liberated from traditional content restrictions by having a Creative Commons licence, you can find it, and use it without worry. But be sure to read up on the Creative Commons Licence.
I hope all Slaw users are using the Google Advanced Search Page as a default. It gives you so much more control over results.