Terms of Use

User may:

Use, view and link to any page on the site.
Print any page and distribute printed copies on a non-commercial basis. User may charge to cover the costs of printing and distribution.
Create courses or other documents that have links to any page in the site, even if that makes it look like the pages are part of the course, so long as the page contents are not modified.

User may not:

Copy any file on the site electronically, other than for the purposes stated above.

Any of the above can be changed by request to the author."