Actually, it's not a technicality- not even close.
It's a criminal offense in most jurisdictions to do this and it pretty much taints ANY evidence submitted by the source(s) which now must be disregarded by the court. It's called altering evidence, which is intrinsically viewed the same as falsifying it for good reason. If the evidence was valid, why did it need to be "altered"? If it's to protect the parties in question, that's a dirty hands situation, which WOULD have altered the outcome (You can't come running to the courts when you just broke the law yourselves... Typically calls for a motion to dismiss when you have this come out...).
The Judge now can sanction the IFPI/MPAA and their counsel in varying ways including jail time for contempt of court.