Hi, from SOLIDWORKS KB:
Is data traffic between client and server in SOLIDWORKS® Enterprise PDM encrypted and secure?
The following applies to encryption in a Enterprise PDM environment: - User credentials (username, password etc) are always sent encrypted between client and archive server. - File traffic is sent over unencrypted TCP sockets between client and archive server. In a WAN environment it is recommended to use VPN tunnels to secure the traffic. - SQL traffic is by default unencrypted, but can be encrypted using Secure Sockets Layer (SSL). See details in solution S-015136. - Web traffic is by default unencrypted but can be encrypted using SSL (HTTPS)