As an attorney myself, I'm surprised your patent attorney's havn't helped you guys out some more in respect to the whole confidentiality agreement thing. Also, did you guys jump straight to talking to patent attorneys? You don't need a patent attorney to discuss confidentiality agreements, even if it is in relation to something you have patented you just need someone who has sat on the patent bar for the patenting process itself. I say this because patent attorney's tend to be some of the highest paid per hour attorney's around. I do some some soft IP stuff myself (copyrights, trademarks) so I wish you luck.