另一个例子可能是颁发证书或组织会员资格的商业机构。
Another example might be of a business that issues certifications or organizational memberships.
PAC 版本应该由颁发证书的权威机构进行维护；当用户组的成员关系发生变化时，版本也应该变化。
PAC versions should be maintained by the certificate-issuing authority; the version should change when the user's group membership information changes.
此外，著名的证书颁发机构需要先验证请求者的身份，然后才会颁发证书。
In addition, a reputable certificate authority will require proof of the requestor's identity before issuing a certificate.
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