Don’t dissemble. You should ask about what their concern is (you getting hit by a bus, you losing interest, etc.) so that you can find a solution that will work for them and other similar customers. One of our licensees had a lawyer who asked us to put our source code in escrow, in case we got acquired or went under. It was a little embarrassing for her when I explained that they already had our source code, which wa…
Side note on escrow - we get asked this from time to time. We respond, we're happy to provide it on certain plans and quote them for it. No one has ever taken us on it. In b2b you never say no, always have an option for what they're asking and charge more for it.
This is the right way. Never say No but also don't just say Yes. A lot of times B2B customers are just doing a checklist and once they hear that it will cost more, they would drop it. I have been asked for escrow by customers paying $299/mo and I laugh internally first and then tell them "For escrow, you will need to be on our enterprise plan starting at $xx,000 per year with a minimum 3 year contract. let me know if this is something you would be open to". Usually crickets after that.