Is VMware Horizion/ PCoIP protocol "secure" over internet?

I'm reviewing Horizon client traffic on the outside interface of the firewall.

Outside interface it's a mix of tcp/443 and tcp/4172. The tcp/4172 gets classified as PCoIP client on the outside interface.

On the DMZ the broker(?) makes tcp/4172 connections that the firewall classifies as either PCoIP or SSL over tcp/4172.

I'm suspicious of the Horizon PCoIP tcp/4172 client traffic going over the internet - is it 100% encrypted or not?