Signatures are generally divided into independent and * * *. Theoretically, a certificate can sign many packages, and there is no limit to the types of packages. This is that * * * enjoys the signature, but the signature will be lost, so there is no guarantee that the corporate signature will not be lost. Generally speaking, * * * will be lost 3-4 times a month, while independent signature ensures the stability of the certificate by controlling the type and number of applications, and the number of signature losses will be less, but the price will be relatively higher. You can trust me privately if you need to sign ~