QDL will not share your account information (username, password, and email address) with anyone else, for any reason. This statement makes it illegal for us to do so.
When you log into QDL, a cookie is created that stores your username, and an encrypted form of your password. As long as this cookie is present on your machine, continued access to QDL will not require re-entering the username and password. This cookie will persist until you explicitly log out of QDL, or close the browser. The password cannot be derived from the cookie, but a hacker with access to your machine while you're logged in can copy the cookie, and then log in as you from elsewhere. So log out of QDL before leaving your machine unattended, or lock the machine.