There are enough litigation examples on this issue around to suggest their fears are well placed. A confidentiality agreement (also called a non_disclosure agreement) and followed by a letter of intent is the two step process for allowing a business concept owner to establish a new business relationship without losing control of their business idea.
Disabled persons: When the parents of a disabled person have passed away, courts will rely on the family's letter of intent to try to figure out what the wishes of the family are for the disabled relative. A letter of intent is sometimes the glue that holds a potential deal together. While deals are done in the business world and other areas of life every day, usually the beginning of any deal was originally laid out in a letter of intent.