Patent Infringement notice. Enfold Theme Source code

A client of mine that I used the Enfold theme for their website build received a notice that the source code was using a security protocol that was theirs and they were infringing on a patent? Any help understanding what they are referring to and eliminating said code would be appreciated. I have more detailed info in the letter i can share.

“Based on publicly available information, your website infringes the Patent
by making, using, selling, importing, and/or offering for sale products and
services that practice the claimed inventions of the Patent, inducing others to
make and use such products in an infringing manner, and/or contributing to the
making and use of infringing products and services by others, including its
customers, who directly infringe the Patent.

In particular, your website (the “accused instrumentality”) infringes at least claim
1 of the ‘844 patent.”
——
Figure 1 below shows the basic ful TLS handshake:
C l i e n t
Key ^ ClientHello
Exch | + key_share*
| + signature_algorithms*
| + psk_key_exchange_modes*
v + p r e s h a r e d k e y *
Server
ServerHelo ^ Key
+ key_share* 1 Exch
+ pre_shared_key*
(Certypice guests. Server
Params
{Certificate*}
{CertificateVerify*} | Auth
{Finished}
[Application Data*]
v {Finished} [Application Datal
https://datatracker.ietf.org/doc/html/rfc8446
[Application Data]