license_escape() {
	env ARACHNOPRESS_COPYRIGHT_HOLDER="$copyright_holder" \
	awk -v year="$copyright_year" '
		function replace(s, needle, value,   p, out) {
			out = ""
			while (p = index(s, needle)) {
				out = out substr(s, 1, p - 1) value
				s = substr(s, p + length(needle))
			}
			return out s
		}
		BEGIN {
			holder = ENVIRON["ARACHNOPRESS_COPYRIGHT_HOLDER"]
		}
		{
			line = replace($0, "<YEAR>", year)
			line = replace(line, "<COPYRIGHT_HOLDER>", holder)
			gsub(/&/, "\\&amp;", line)
			gsub(/</, "\\&lt;", line)
			gsub(/>/, "\\&gt;", line)
			print line
		}
	' "$license_file"
}