This means you are attempting to download a video which has been flagged by YouTube. This can result in them being restricted for access by people over 18 years of age. When you attempt to view a restricted video on YouTube in your web browser, YouTube requires to you to log in to verify your age. When you attempt to download a restricted video from YouTube using YouTube Downloader, YouTube Downloader will prompt you for your YouTube username and password so that it can download the video for you. This is the user name and password you use on Youtube. YouTube Downloader does not have user accounts. If you do not have a YouTube user account, you can create one by going to YouTube and clicking the “Sign Up” link at the top of the page. In order to keep your information safe, your username and password are only used for the current running instance of YouTube Downloader and will not be saved on your computer. Once you exit YouTube Downloader, it will forget your account information and yo