Understanding technical terms used in SSL is essential. Here you can learn more about:
Depending on your needs or your technical pool,you may need to install your certificate on several machines.
Some certificates are sold to be installed on a unique machine (physical or virtual).The additionnal licence makes then possible to duplicate an existing certificate instead of buying a new one for each different machine you may use.
Several configuration can be encountered :
GlobalSign's certificates evolve and are now sold with unlimited machines licenses.
So, install your certificates on as much machines as you need for the price of one product !
A new certificate can be reissued in substitution of an existing one with the same fields but a different pair of keys*.
That can be done in those situations:
*pair of keys : Item privet key / public key elements : if a new pair of keys is needed a new CSR has to be requested.
A multiple site certificate is issued to secure several domains (or SANs) hosted on a same server:
It is then possible to secure other domains by purchasing additionnal SANs instead of buying a new certificate for each extra domain.