Why do you need protection after writing a plan? Well, you put a lot of work into it and you want to make sure that someone doesn’t copy it or share it with others who can take it to market before you. If you are submitting your plan to a bank or recognized financial institution or a legitimate government or public funded organization this is not necessary as these staff are bound by confidentiality and conflict of interest rules. However if you are working with someone you do not know, consider researching these terms to protect yourself. If you have a specific product plan or product awaiting patent or unique idea, keeping the idea secure an protecting it is key.
A non compete agreement is used when you are sharing your plan with private investors or funders. Consider getting them to sign an agreement saying they will not copy your concept and plan and open a similar business.
A non disclosure agreement is used when you are sharing information about your plan and that you wish it to remain confidential. You get the parties you are sharing with to ensure they do not disclose information on in your plan, especially to competitors.