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As stated, all work is distributed under the Creative Commons license, please familiarise yourself with this before using the documents. If you believe that it is your copyright being infringed, please contact us immediately and we will withdraw the offending document pending investigation.
Creative Commons License
Essentially, you are free to use any of the content of this site provided you do not make any commercial profit from it. In essence, we don't want to see this stuff in books lining publishers pockets if you know what mean.
More information can be found here:
http://creativecommons.org/licenses/by-nc-sa/3.0/