Hello, Is there a way to be sure that a website is going to be accessed only by traditional browsers and not from another software that send to the server the same headers of any of the traditional browsers? For example, supose that i only want to give access to my site users from firefox, ie, chrome and safari, because i know that the users can´t download the copyright information of the website to the temporary files with anyone of this browsers. How can i be sure that someone that develop a mini-browser or a software can´t access my site sending the same header information of traditional browsers? In this case, the validation of HTTP_USER_AGENT isn´t a solution. Thanks.