There is nothing special about EV certificates except their extortionate price tag and the fact that they have a magic flag set which will cause the site name to show up on a green background in the browser. You don't get to produce your own EV certificates the way you can produce ordinary certificates (e.g., using OpenSSL) because the magic flag is CA-specific, and browsers that support EV certificates contain a hard-coded list of the CAs which are part of the EV certificate cartel and their corresponding magic flags.
Basically, for EV certificates, the CAs that are in on the game promise that they will actually do the sort of checking they should have been doing for all certificates in the first place. That is, somebody applying for an EV certificate for an entity will have to prove that the entity really exists at the specified address. This is then used to justify a vastly increased price for the certificate.
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