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I was commissioned on a freelance basis to write the booklet for an agreed fee, there was no contract. There was an understanding that I would be contacted in the future to help update the book. (They told me this verbally).
When I recently questioned why they had re-printed with-out my name I was told the content of the booklet and therefore the copyright was theirs as they had published the material. This just doesn't ring true to me.
This piece actually went out to approx 50,000 customers.