To who it may concern,
I have just visited your website to recommend friends on the use of other pdf readers.
Could Sumatra be added for the list for windows users?
http://blog.kowalczyk.info/software/sumatrapdf/free-pdf-reader.html
It is GNU GPL v3.
Also Firefox for windows can be used as pdf viewer and as far as I know it is on a free software licence.
Regards,
--
Andrés Muñiz Piniella
National Physical Laboratory
http://www.npl.co.uk/people/andres-muniz-piniella
+44 20 8943 8679