Deliver all of your proposal and documents via Docusign, and to access the documents, they'll click OK, and within the documents they'll be signing your non disclosure agreements. Let me also advice you to place in clear public view the value of your work. Without that in the agreements, you'll never collect a dime. You must also specify the use of these documents, and define the misuse of these documents.
The Documents need to contain these limitations of use, and strictly forbid the use and viewing of these documents except by the need to know members of the team at ABC company. Any use by anyone other than these is strictly a no-no and strictly enforced.
Every industry has fought this battle from landscapers, etc... But you need to set the ground rules early in the sales process, you need to a budget, how else can you know if they can afford you or your product. Don't let them wiggle off the hook and not share a budget, and challenge them when they do. $25,000, uh, is that to include three years of onsite support too?
Place a value on the proposal right up front, and you're happy to present a full proposal on one condition.
try this too.
1. You want to be the last proposal they review, and when you arrive with the proposal you want to leave with your proposal or a signed sales agreement. You'll bring you sales engineer and price book if we need to make any changes right there.