faq: Add section on US export restrictions.

doc/faq.org

@@ -1167,13 +1167,8 @@ update this FAQ in the next month.  See the section "Changes" for recent updates
    :CUSTOM_ID: i-get-sed-errors-when-running-configure-on-mac-os-x
    :END:
 
-    This will be fixed after GnuPG has been upgraded to autoconf-2.50.
-    Until then, find the line setting CDPATH in the configure script
-    and place an:
-
-    : unset CDPATH
-
-    statement below it.
+    This problem has been fixed for all modern GnuPG versions.
+    (By using an autoconf 2.50 generated configure script).
 
 ** Why does GnuPG 1.0.6 bail out on keyrings used with 1.0.7?
    :PROPERTIES:
@@ -1470,6 +1465,41 @@ update this FAQ in the next month.  See the section "Changes" for recent updates
     of the listing before before starting the import.
 
 
+* Bug reporting and hacking
+  :PROPERTIES:
+  :CUSTOM_ID: bugreports-et-al
+  :END:
+
+** Copyright asssignments
+  :PROPERTIES:
+  :CUSTOM_ID: copyright-assigments
+  :END:
+
+** U.S. export restrictions
+  :PROPERTIES:
+  :CUSTOM_ID: us-export-restrictions
+  :END:
+
+GnuPG has originally been developed in Germany because we have been
+able to do that without being affected by the US export restrictions.
+We had to reject any contributions from US citizens or from people
+living the the US.  That changed by end of 2000 when the export
+restrictions were basically dropped for all kind of freely available
+software.  However there are still some requirements in the US.
+Quoting David Shaw: mail
+#+begin_quote
+For each release of GPG that I contributed to, I sent an email
+containing a pointer to the new source code to the Commerce
+Department.  The rules changed slightly in 2004, so that you could
+send a single email and then be done until the information in that
+email changed, so I just sent "www.gnupg.org" and haven't bothered
+with the email since.
+#+end_quote
+
+The rules: http://www.bis.doc.gov/encryption/pubavailencsourcecodenofify.html
+The 2004 rule change: http://edocket.access.gpo.gov/2004/04-26992.htm
+
+
 * Acknowledgements
   :PROPERTIES:
   :CUSTOM_ID: acknowledgements