Sign a California Nondisclosure Agreement (NDA) today. Many people have a California Nondisclosure Agreement (NDA). Because it is essential to running a business in California. NDA, a law created in California for consumers, is well-intentioned, but it is a law that disadvantages many California businesses. Various people come to California to try to run a business, but many of them break down and give up in front of the NDA wall. This means that operating a business in California and NDAs are notorious.