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diff --git a/src/lib/blacklist.sh b/src/lib/blacklist.sh
new file mode 100644
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+++ b/src/lib/blacklist.sh
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+#!/usr/bin/env bash
+# This may be included with or without `set -euE`
+
+# Copyright (C) 2013-2014, 2016 Luke Shumaker <lukeshu@sbcglobal.net>
+#
+# License: GNU GPLv2+
+#
+# This program is free software; you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation; either version 2 of the License, or
+# (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+# make sure XDG_CACHE_HOME is set
+. "$(librelib conf)"
+
+# Usage: blacklist-normalize <$file
+# Normalizes the syntax of the blacklist on stdin.
+blacklist-normalize() {
+	sed -e '/^#/d' -e 's/^[^:]*$/&::/' -e 's/^[^:]*:[^:]*$/&:/'
+}
+
+# Usage: blacklist-cat
+# Prints the blacklist.
+# Uses the cache, but downloads it if it doesn't exist.  Also normalizes the blacklist for easier parsing.
+blacklist-cat() {
+	local file="$XDG_CACHE_HOME/libretools/blacklist.txt"
+	if ! [[ -e $file ]]; then
+		# exit on failure, whether set -e or not
+		blacklist-update || return $?
+	fi
+	blacklist-normalize < "$file"
+}
+
+# Usage: blacklist-update
+# Updates (or creates) the cached copy of the blacklist.
+blacklist-update() (
+	. libremessages
+	load_files libretools || return 1
+	check_vars libretools BLACKLIST || return 1
+
+	local remote_blacklist="$BLACKLIST"
+	local local_blacklist="$XDG_CACHE_HOME/libretools/blacklist.txt"
+
+	_l stat_busy "Downloading blacklist of proprietary software packages"
+
+	mkdir -p "${local_blacklist%/*}"
+	if wget -N -q -O "${local_blacklist}.part" "$remote_blacklist" 2>/dev/null; then
+		stat_done
+		mv -f "${local_blacklist}.part" "$local_blacklist"
+	else
+		stat_done
+		rm "${local_blacklist}.part"
+		if [[ -e "$local_blacklist" ]]; then
+			_l warning "Using local copy of blacklist"
+		else
+			_l error "Download failed, exiting"
+			return 1
+		fi
+
+	fi
+)
+
+# Usage: blacklist-cat | blacklist-lookup $pkgname
+# Filters to obtain the line for $pkgname from the blacklist on stdin.
+# Exits successfully whether a line is found or not.
+blacklist-lookup() {
+	local pkg=$1
+	# we accept that $pkg contains no regex-nes
+	blacklist-normalize | grep "^$pkg:" || true
+}
+
+# Usage: blacklist-cat | blacklist-get-pkg
+# Prints only the package name field of the blacklist line(s) on stdin.
+blacklist-get-pkg() {
+	blacklist-normalize | cut -d: -f1
+}
+
+# Usage: blacklist-cat | blacklist-get-rep
+# Prints only the replacement package field of the blacklist line(s) on stdin.
+blacklist-get-rep() {
+	blacklist-normalize | cut -d: -f2
+}
+
+# Usage: blacklist-cat | blacklist-get-reason
+# Prints only the reason field of the blacklist line(s) on stdin.
+blacklist-get-reason() {
+	blacklist-normalize | cut -d: -f3-
+}