Anyone may download, print, or store on a computer, free and without restriction, provided that:-
The copy of the page or drawing is unaltered and the author correctly identified
The material is not offered for sale
The drawings and text are not relocated unless full attribution is given
The material is for personal or teaching use.
Putting this site together has been a huge undertaking and, although it is a hobby and I don't make any money from it, I don't want to lose control of the IP.