Proactive DLP requires separate licensing for MetaDefender to enable this module.
With Proactive DLP module, MetaDefender can detect and then block or prevent and then allow data transferring between networks. Here are the details functions for each approach you have chosen.
Detect and then block approach
Prevent and then allow approach
System requirement:
Microsoft Visual C++ 2017 Redistributable Package
Linux version:
Does not support Centos 6 and Debian 8