mirror a protected dropbox file every 24 hours

Need to have a file mirrored from someone their dropbox every 1 hour and save on my own shared webhosting server. Everytime with php I get the error, "unable to read protected pdf document". So I want the following: 1) Original protected PDF file: [login to view URL]%E0%B9%83%E0%B8%9A%E0%B8%A3%E0%B8%B2%E0%B8%84%E0%B8%B2%E0%B8%99%E0%B8%B2%E0%B8%8B%E0%B9%88%E0%B8%[login to view URL] (replace [login to view URL] with [login to view URL]) 2) Mirror this file and make writeable to my webserver on [login to view URL] (you get ftp access ofcourse) 3) Make it work so that it will be overwritten every hour. Budget $5-$10 I HAVE NO ROOT ACCESS ON MY SERVER BECAUSE ITS SHARED, SO HAS TO WORK WITH WHAT I HAVE :)