No, I don't think you do. If I had to consult an intellectual property lawyer every time I wanted to make use part of a copyrighted work, I'd quickly run out of money. I think this is clearly a fair use of the material.
Philip Hibbs http://www.snark.freeserve.co.uk/ Opinions expressed may not even be my own, let alone those of any organisations, nations, species, or schools of thought to which I may be affiliated.
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