This is what I found on http://readyouth.blogspot.com/2005/03/disabling-yousendit-download-limit.html about this:
Please keep in mind that when using Yousendit, always rename your file to something insignificant, as opposed to the actual filename itself. A simple example is to rename TheBeatles.rar to fe565tert4.rar. I personally recommend putting a password on the compressed file in addition to renaming the file.
This simply keeps the snooping eyes at Yousendit from seeing what is actually being transferred. Although I am unaware of anyone being fined or prosecuted from Yousendit, I have heard of people being banned from the server for sending copywritten files none the more educated as to what is being transferred. Moreover, Yousendit reserves the right to remove any file, even on the thoughts of suspicion. It is troublesome to spend time uploading a file, only to have it immediately deleted from the server.
