When you sign into the collaborative information center for the first time, you are presented with a set of legal terms and conditions to follow as a site contributor. When signed in, you can display the terms of use at any time by clicking Tools > Terms of Use in the comment area at the bottom of pages.
Everyone, whether a contributor or a reader, needs to understand how to regard the contributed content.
Here are some highlights.
Specifically, for contributors:
The formal Terms of Use take precedent over anything stated in the preceding summary.