Is there a license fee / warranty / registration form / expiration?
No, none of these. It’s completely free of charge. JUNKBUSTERS offers the software to everyone to copy, use, modify and distribute in perpetuity at no charge under the GNU General Public License. It comes with no warranty of any kind. You don’t have to register. (There is no way to do so.) We are happy for you to use the software as anonymously as possible. (Your IP address will naturally be disclosed when you download it, so if you work for a web ad company you might want to use a service such as the Anonymizer when you get it. We never want to be given any information that you consider private or confidential.) We are often asked why we give away a product that many would happily pay for. The answer is that we are determined to carry out our mission: to free the world from junk communications.