I use iTunes to listen to music and I use Wuala to backup my mp3-files. Before recent versions of iTunes, I never had any problem with that. But with more recent versions (I don't know when it started, but the problem definitely occurs in the current version 10.7), there is a problem: Whenever I listen so a song on iTunes, Wuala makes an update of the backup, i.e. the songs that i listened to are uploaded anew. This means that Wuala thinks that the file has been changed. I find it really annoying because this uses CPU and bandwith when I listen to music. I want to solve this problem.
My question: Is it true that iTunes, in more recent versions, changes the mp3-file when listening to a song, or is the problem caused by newer versions of Wuala?
EDIT: Thanks, Dave K. Comparing checksums is a good idea. I've just done the same: I checked the checksums before and after playing a few tracks, and none of the checksums changed. However, Wuala still uploads played tracks. On this screenshot, one can see that Wuala uploads tracks the checksum of which has not changed:
Thus, Wuala updates files which haven't changed. What else could be the reason why the tracks are uploaded? I noticed that iTunes opens the mp3-files with write access, as one can see from the fact that the information in Finder shows identical times for "modified" and "last opened" (is this a correct conclusion?):
Could that be the reason why Wuala uploads the files? Where is the information stored that a file has been last modified at a certain time? (not in the file, since the checksum doesn't change)