The copyright file is missing documentation for print-sunrpc.c,
rpc_auth.h, and rpc_msg.h. In the packaged version they are licensed
under non-free Sun RPC license but upstream has relicensed them to
BSD-3-Clause at
https://github.com/the-tcpdump-group/tcpdump/commit/b4c1686936096a305faadc866333c11b81e3c2f9

Please document that you are choosing to distribute under the new
license terms.