iTunes 7.4.1: Block Ringtones Creator

Couple of hours after the release of iTunes 7.4, Apple announced iTunes 7.4.1 with no further information than those provided for the previous version. We suspect this update to prevent the procedure preventing users to easily generate ringtones from their music tracks in iTunes. One only needed to duplicated the file, then rename its extension from .m4a to .m4r. Then, you could synchronize your iPhone, and ringtones will be accepted.
Indeed, after installing iTunes 7.4.1, such trick does not work anymore; and we suspect Apple to act on purpose to limit such procedure for creating ringtones, in order to keep selling ringtones. We would be interested to know according to EU regulations, how a company could prevent a user to create a ringtone from a music track purchased legally. If a lawyer read those lines, he/she can drop me an email (linathael at macbidouille dot com)