How the Encrypted data is passed via the servers?

Is JotForm zero knowledge? I.e. Is form responders data encrypted locally before hitting the submit button and then decrypted only by the form creator?

Perhaps another way of asking this is if jotForm server administrators have access to the unencrypted data . Thank you

A secure HTTPS form encrypts data in transfer, an encrypted form encrypts the stored data on top of that. There is no way to decrypt the stored submission data without the correct private key. For ultimate security, we do not store the private keys on our end when you use encrypted forms.

Guide: https://www.jotform.com/help/344-Encrypted-Forms-and-How-to-Use-Them

Thanks.