Our servers use WHM (from the developers of cPanel), and they come with a license. If you host with us (I'm not sure that you do now), the license is part of the account that you establish. If you were to get a dedicated server account, then you would be able to manage the server through WHM and add multiple cPanel accounts (under the dedicated server or VPS) without having to purchase a license for each. If you need more information about how WHM works, check out Using WHM to create a cPanel Account.
I hope this helps to answer your question, please let us know if you require any further assistance.
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