Since you don't have any documentation or agreements between parties, you can also most certainly expect a lawsuit addressing all of this under the event you be

Since you don't have any documentation or agreements between parties, you can also most certainly expect a lawsuit addressing all of this under the event you become successful with your efforts. I would therefore consult with an attorney, and see what the ramifications truly are, and what long term items you must now consider in the event your idea becomes successful.