LicenseDNS is described as 'Enables software vendors to implement licensing using DNSSEC. To validate a license, send a DNS query to any DNS server and receive cryptographically verified license data. All platforms and langauges are supported' and is a License Manager in the security & privacy category. There are more than 10 alternatives to LicenseDNS, not only websites but also apps for a variety of platforms, including Windows, Linux, Mac and Windows Phone apps. The best LicenseDNS alternative is LM-X License Manager. It's not free, so if you're looking for a free alternative, you could try Labs64 NetLicensing or LicenseSpot. Other great sites and apps similar to LicenseDNS are CryptoLicensing For .Net, 10Duke Entitlements, Nalpeiron and Software Protector.