Short description of Infralution Licensing System 4.0: Infralution Licensing System (ILS) is an affordable, 100% .NET solution for licensing components and applications using secure encrypted license keys. ILS uses a public key encryption algorithm to verify license keys which makes it virtually impossible for a cracker to reverse engineer license keys from your code. Authentication adds another level of security by authenticating license keys (using a web service) when the license is installed.