We’ve got a secret to tell you… if you don’t make use of a confidentiality agreement (often called an “NDA”), you will need to rely on the law of Confidential Information, which is far from ideal.
In order to bring a claim, you will need to show that the information had a necessary quality of confidence, that the idea was disclosed to the potential defendant in circumstances where an obligation of confidence can be assumed and that there has been an unauthorised use of the information. All 3 elements can be difficult to prove.
You can easily find a large selection of template confidentiality or NDA Agreements online. We always caution against using these because each situation where vital information, documents, designs or physical items are being disclosed is different. A tailored agreement, drafted by solicitors, which both you and other involved parties fully understand, is recommended, especially given what’s at stake.