This file is indexed.

/etc/snort/rules/experimental.rules is in snort-rules-default 2.9.2-3ubuntu1.

This file is owned by root:root, with mode 0o644.

The actual contents of the file can be viewed below.

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# Copyright 2001-2005 Sourcefire, Inc. All Rights Reserved
#
# This file may contain proprietary rules that were created, tested and
# certified by Sourcefire, Inc. (the "VRT Certified Rules") as well as
# rules that were created by Sourcefire and other third parties and
# distributed under the GNU General Public License (the "GPL Rules").  The
# VRT Certified Rules contained in this file are the property of
# Sourcefire, Inc. Copyright 2005 Sourcefire, Inc. All Rights Reserved.
# The GPL Rules created by Sourcefire, Inc. are the property of
# Sourcefire, Inc. Copyright 2002-2005 Sourcefire, Inc. All Rights
# Reserved.  All other GPL Rules are owned and copyrighted by their
# respective owners (please see www.snort.org/contributors for a list of
# owners and their respective copyrights).  In order to determine what
# rules are VRT Certified Rules or GPL Rules, please refer to the VRT
# Certified Rules License Agreement.
#
#
# $Id: experimental.rules,v 1.78.2.1.2.1 2005/05/16 22:17:51 mwatchinski Exp $
# ---------------
# EXPERIMENTAL RULES
# ---------------
# These signatures are experimental, new and may trigger way too often.
#
# Be forwarned, this is our testing ground.  We put new signatures here for
# testing before incorporating them into the default signature set.  This is
# for bleeding edge stuff only.
#