-- the 'correct' password
real_password = "password";

-- prompt the user to enter a password
user_password = Dialog.PasswordInput("Password", "Please enter the password: ", MB_ICONQUESTION);

-- compare the user's password to the 'correct' password.
-- If the user supplies the wrong password, exit the program.
if real_password ~= user_password then
    Application.Exit();
end

-- Initialize variables
days_left = 30;
date_installed = Application.LoadValue("My Application", "Date Installed");
time_limit = 30; --the length of the trial period, in days

-- Convert string value to number
date_installed = String.ToNumber(date_installed);


-- Was date_installed 0 (non-existent)?
if date_installed == 0 then
  -- Value was nonexistent, create it
    Application.SaveValue("My Application", "Date Installed", System.GetDate(DATE_FMT_JULIAN));
else
  -- Update days_left
    days_left = (date_installed + time_limit) - System.GetDate(DATE_FMT_JULIAN);
end

-- Are there days left?
if days_left < 1 then
  -- There are not any days left, alert user and exit.
    Dialog.Message("Trial Period Over", "This software has expired");
    Application.Exit();
else
  -- There are days left, alert user how many
    Dialog.Message("Trial Period", "You have "..days_left.." days left in your trial period.");
end