The National Bureau of the World Intellectual Property Organization has given the following definition in the Model Invention Law of Developing Countries formulated by 1964: "The so-called proprietary technology refers to the manufacturing process and the use and knowledge of industrial technology". In the Dictionary of Modern Economic Law published by Peking University Publishing House, the definition of proprietary technology is: "Proprietary technology is technical knowledge, technical information, experience, methods or their combination that has certain value, can be used, is unknown to the public, and can be transferred or taught, and does not enjoy patent rights." In a word, proprietary technology is the sum of secret technology knowledge, experience and skills. It can be expressed as written materials, such as design drawings, design schemes, operating procedure guidelines, data, etc. It can also be manifested in the technical demonstration, training and oral teaching of engineering and technical personnel. But as far as proprietary technology itself is concerned, it is an idea and concept contained in these forms of expression.