I have previously written about the arms race between Apple and those who seek fair use of the tunes they buy from the iTunes Store. Ver. 4.5 of iTunes defeated Playfair’s de-DRM strategy; Hymn renovated it. Now Apple’s up to ver. 4.6 and, if you really need to upgrade (?perhaps to avail yourself of AirTunes’ functionality?) you will find that Hymn’ed songs won’t play. Hymn embeds the user’s name and email address in the unprotected .mp4 file it makes as a sign of good faith, as if to insure that the unprotected files are not redistributed. Well, iTunes 4.6 looks for the embedded identification information and simply refuses to play those files. Here is a method of getting past that in iTunes 4.6 by taking a hex editor to your unprotected songs.