DVD is ejected from my imac Superdrive

Hi all,
I’m running on Panther, then some DVD I was easily reading before don’t mount now. I’m think that I accidentaly installed a new security update or something like this that make my Superdrive protecting from illegual copies.
So, my question is: is there a way to disable read protection?

Warning: I’m not sure that is the real problem. because one of the DVD that I can’t mount doesn’t seems to be protected (it don’t have the protection circle on its back)…

Thx to help :slight_smile:

To post once about it is enough > My DVD is ejected