If a playlist contains any songs purchased from the iTunes Store, iTunes software restricts the number of times the same playlist may be burned to seven.
Notes
iTunes software may be used to reproduce materials. It is licensed to you only for reproduction of non-copyrighted materials, materials in which you own the copyright, or materials you are authorized or legally permitted to reproduce. If you are uncertain about your right to copy any material, you should contact your legal advisor. See the iTunes Music Store Terms of Service for additional information.