1. State secrets: include important military, political, diplomatic and economic confidential information of the country, such as the country's strategic deployment, major decision-making and national defense construction.
2. Trade secrets: confidential information related to the business activities of the enterprise, such as product research and development plan, market strategy, customer list, financial data, etc.
3. Personal privacy: Personal information, such as ID number, bank account number, health status and home address.
4. Patented technology: The patented technology, unique technology and innovative design of an enterprise can be regarded as sensitive and confidential.