Seeking Someone to License the Heart of Your Company?

dcdukeu asks: "We're a small software company that is about to enter into an 'Acceptance Period' with a much larger company for the purpose of determining if they want to license the source code and intellectual property of our main product. This involves giving them our source code, whitepapers, and providing the technology transfer of how things work. Once they receive this they get 45 days to determine if they want to move forward and incur royalties plus payment minimums. What I want to know is if other people have dealt with this before and what would they recommend in terms of how we can turn our information over to them in a time sensitive way (e.g. after 45 days the documents they receive cannot be viewed any more). We are basically giving up everything we have and training them before they say 'yes' or 'no' as to whether or not they are going to move forward. Thoughts?" Unless there are numerous protections already in place to prevent the larger company from running with the information gleaned from this transfer, this so does not sound like a good idea. If you've been in a similar situation before, what suggestions would you have for dcdukeu?