July 12, 1966. To: Arthur C Clarke
No one can know more than yourself how my obligations and responsibilities during the preparation and actual filming have completely absorbed every day, seven days a week and under these circumstances I have obviously had no opportunity at all to do my share of the revision to the book. It is my right to do this and I have repeatedly expressed to you how important I believe the revisions to be. When you went to New York you promised not to show the manuscript to anyone. Instead of which you have allowed Scott to submit it to two publishers and Playboy magazine.
From The Telegraph