Thank you! They have before aked for proper resolution, so I think using water mark is the way. I guess I can add it in Davinci? Vimeo is also a good way. I wonder if they take that.
The contract doesn't say anything about the isadora files it only says a video, so for that reason I don't think they can demand that. Neither can they demand instructions for others to use it. But for later use and new projects. If you want to share your contract experience of how to write it, please do.
Thanks for helping:)
Eva