Licensing

public sealed class LicenseInfo {
 
    // Create a new LicenseInfo instance to retrieve informations about a pair of identifier/key
    // This class should not be used to register your product. Please use static function RegisterLicense to specify your license.
    public LicenseInfo(string licenseIdentifier, string licenseKey)
 
    // Remaining days of the trial period. Null if the product is licensed. It could be negative if the trial period is ended since several days.
    public int? EvaluationDaysLeft { get; }
 
    // The date the trial period starts. If the product is licensed, the date of the library first use.
    public DateTime EvaluationStartDate { get; }
 
    // The date you get the license
    public DateTime? LicenseIssuedDate { get; }
 
    // The license key supplied by UnderAutomation (null for trial period)
    public string LicenseKey { get; }
 
    // Name of your organisation
    public string Licensee { get; }
 
    // The date your maintenance contract end and you no longer can use this license with newer versions.
    public DateTime? MaintenanceExpirationDate { get; }
 
    // Number of maintenance years included in your license
    public int MaintenanceYears { get; }
 
    // Commercial name of this .NET Software library
    public string Product { get; }
 
    // The date this version of the product was released.
    public DateTime ProductReleaseDate { get; }
 
    // The current license state
    public LicenseState State { get; }
 
    // A human description of the license
    public override string ToString()
 
    // The date the product will expire. Null if the product is licensed.
    public DateTime? TrialPeriodExpirationDate { get; }
}

public enum LicenseState {
 
    // The trial period as expired, you no more can use the library
    Expired = 3
 
    // The library is in an extra trial period, you can use the library
    ExtraTrial = 2
 
    // The pair License Identifier and License Key are incompatible, you cannot use the library
    Invalid = 0
 
    // Congratulations, the library is licensed.
    Licensed = 5
 
    // Your license does not allow you to use such a recent release. Please buy maintenance to use this version
    MaintenanceNeeded = 4
 
    // No license has been provided
    None = -1
 
    // The library is in a trial period, you can use the library
    Trial = 1
}

public class InvalidLicenseException : Exception, ISerializable {
 
    // The license that causes this exception
    public LicenseInfo LicenseInfo { get; }
}