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Like mentioned you may use the material from this website free of charge if you

a) wish to use the material for private purposes; not for professional purpose and
b) your website doesn't have any illegal, rassistic or pornographic material and
c) you put a link back to my website.

Further information, also regarding professional use of the materierl can be found in the terms of use

Following you find various possibilites for a back link. Please copy the code and place it anywhere in your website.