Bro includes an unmodified build of rsync 3.4.4 as a separate helper executable.

Copyright (C) 1996-2026 Andrew Tridgell, Wayne Davison, and others.
rsync is licensed under the GNU General Public License version 3.

The complete corresponding source archive, its upstream signature, and the
GPL license are included beside the helper inside Bro.app. The upstream source
was downloaded from https://download.samba.org/pub/rsync/rsync-3.4.4.tar.gz.

Build configuration:
  --disable-xxhash --disable-zstd --disable-lz4 --disable-openssl
  --enable-acl-support --enable-xattr-support

Bro invokes rsync as a separate process. Verkheim's Bro source code is not part
of rsync and rsync is not linked into the Bro executable.
