As an academic, publishing is the lifeblood of my career.
I cannot sign legal instruments that could (accidentally) jeopardize my ability to publish.
Fortunately, academics regularly extend and expect to receive a professional confidentiality during peer review of unpublished research and grant proposals.
I am more than happy to extend the same professional confidentiality to you for the technical review of your idea or artifact.
I understand that this professional confidentiality may not be enough to satisfy your concerns, and if that is the case, I accept that I must pass on this opportunity to collaborate and I thank you for your interest.