Depending on what is at stake, there are several options available for protecting your business ideas from being stolen or copied by others. If you would like to ensure that your business partners or employees do not share important business ideas or information with others, your best bet may be to create a non-disclosure or non-compete agreement that employees can be required to sign. These types of agreements help to ensure confidentiality among employees and other individuals associated with your business, and they also protect against their leaving your company to create a competing business nearby that utilizes your ideas.
If your business idea is revolutionary or has required extensive money and time on your part, you may wish to seek a patent or trademark to protect your idea. These are legal protections offered by the government and typically require a fee to obtain.