+<para>
+ Privoxy heavily relies on Philip Hazel's PCRE.
+</para>
+
+<para>
+ The code to filter compressed content makes use of zlib
+ which is written by Jean-loup Gailly and Mark Adler.
+</para>
+
+<para>
+ On systems that lack strptime(), Privoxy is using the one from the
+ GNU C Library written by Ulrich Drepper.
+</para>