A percentage of shareholders, usually 67% to 90%. A supermajority is often required for a company to take certain actions, such as amending the charter. Some companies require supermajorities as anti-takeover measures. For example, a company may require two-thirds of shareholders to approve of a merger or acquisition.
A certificate authority can issue multiple certificates in the form of a tree structure. A root certificate is the top-most certificate of the tree, the private key of which is used to sign other certificates. All certificates signed by the root certificate, with the CA field set to true, inherit the trustworthiness of the root certificateâa signature by a root certificate is somewhat analogous to notarizing an identity in the physical world.
certificate authority (CA) 1  SSL Certificate Management: Common Mistakes and How to Avoid Them âThawte Inc.  A certificate authority (CA) is a trusted entity that issues electronic documents that verify a digital entityâs identity on the Internet. The electronic documents, which are called digital certificates, are an essential part of secure communication and play an important part in the public key infrastructure (PKI).