Wireshark® is a network protocol analyzer. It lets you capture and interactively browse the traffic running on a computer network. It has a rich and powerful feature set and is world’s most popular tool of its kind. It runs on most computing platforms including Windows, macOS, Linux, and UNIX. Network professionals, security experts, developers, and educators around the world use it regularly. It is freely available as open source, and is released under the GNU General Public License version 2. Does the NpCap product included with Wireshark fall under the GPL2 or is a purchased license required for distribution?
From License --Even though Npcap source code is publicly available for review, it is not open source software and may not be redistributed without special permission from the Nmap Project