Adittionally:

Name : nginx Relocations: (not relocatable)
Version : 1.4.3 Vendor: nginx inc.
Release : 1.el6.ngx Build Date: Tue 08 Oct 2013 02:34:32 PM WEST
Install Date: Mon 02 Dec 2013 05:35:41 PM WET Build Host: centos6-amd64-ovl.t.nginx.com
Group : System Environment/Daemons Source RPM: nginx-1.4.3-1.el6.ngx.src.rpm
Size : 788369 License: 2-clause BSD-like license
Signature : RSA/SHA1, Tue 08 Oct 2013 03:13:36 PM WEST, Key ID abf5bd827bd9bf62
URL : http://nginx.org/
Summary : High performance web server
Description :
nginx [engine x] is an HTTP and reverse proxy server, as well as
a mail proxy server.

Running on fully updated CentOS 6.4.