Npcap is open source and you can find the source code at our Github: https://github.com/nmap/npcap

We don't currently permit redistribution of the binaries which are signed by the Nmap Project (Insecure.Com LLC) using our signing certificate.  This is due to concerns that our signing certificate could possibly be revoked if malware or other shady software was to include these binaries which are signed by us.  We suggest signing Npcap with your own certificate and distributing that instead.

If you do wish to distribute our signed Npcap binaries with your legitimate software, please mail fyodor@nmap.org.  We may be able to make exceptions.  We also plan to look into the ramifications of a less restrictive redistribution policy as soon as we get a chance.

Cheers,
Fyodor