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Target customers: 1. Customers who want to encrypt internal traffic. 2. Customers who want to provide encrypted services. Features released: Private CAs are classified into private root CAs and private intermediate CAs. A private intermediate CA is subordinate to a private root CA. A private root CA may include one or more private intermediate CAs. Only private intermediate CAs can issue private certificates, including server certificates and client certificates. If you create a private CA for the first time, you must first create a private root CA. After you create a private root CA, you can obtain one private root CA and one private intermediate CA. By default, the private intermediate CA has the quota to issue 10 private certificates free of charge. You can create more private intermediate CAs for the existing private root CA based on the organizational structure of your enterprise. For example, you can use the private root CA to create private intermediate CAs for different departments of your enterprise. You can also purchase the quota to issue more private certificates by using the existing private intermediate CA.