[Chris Abram]

I won’t go into the copyright issue as there are several excellent responses to your email. However, have you considered allowing the client to view a set of your rushes BUT MAKING SURE THAT YOU HAVE TIMECODE IN VISION EMBEDDED ON THE TAPE?
If the relationship is still a practical possibility for the future then perhaps a restricted viewing between yourself and the client might just avoid any unpleasanteries and could also lead to more work.
Our company believes that unless it is in black and white in a contract then we do everything to retain copyright.
Good luck

Chris Abram