GeoGuard today announces that the effectiveness of its enhanced geo-filtering solution GeoShield has been rigorously tested by Cartesian (NASDAQ: CRTN), the recognized leader for premium movie and sports content security solution auditing and anti-piracy consulting.The testing process demonstrated the reliability and accuracy of GeoGuards identification of the use of VPNs, DNS proxies and browser plug-ins to obfuscate a users geographical location. GeoGuard protects digital content rights holders against the threat of users gaining illicit access to media by spoofing their location.