Most content on this site is covered by a Creative Content
License. Materials not covered by this license will be explicitly
noted (for example, most of the code is offered under one of the Open
Source/Free Software licenses).
This Creative Commons license essentially says that you have
permission to use the material covered by the license for
non-commericial purposes as long as you attribute it to the author
(that would be me). Click on the Creative Commons graphic for all of
the details.
Of course, this only applies to the material written by me (Jim
Weirich). Material written by others will be covered by their own
copyrights.
Check out the Creative
Commons web site. They have a number of different licences
available, and they do a good job of explaining them. There may be a
license there that suites your needs.