internal void Generate(string registeredEmail, DateTime issueDate, int numberOfDays)
{
RegisteredEmail = registeredEmail;
IssueDate = issueDate;
ExpirationDate = IssueDate.AddDays(numberOfDays);
LicenseKey = string.Format("{0:0000}{1:00}{2:00}{3:0000}{4:00}{5:00}{6}",
IssueDate.Year,
IssueDate.Month,
IssueDate.Day,
ExpirationDate.Year,
ExpirationDate.Month,
ExpirationDate.Day,
RegisteredEmail);
LicenseKey = LicenseKey.Encrypt(Shared.ENCRYPTION_KEY);
}