Complex sentence: Obviously another way of avoiding liability is, although strictly not a defence, to deny what was disclosed was within the injunction by showing confidence had been lost by moving into the public domain, so further publication cannot cause substantial or any prejudice.
Split into simpler sentences: Obviously another way of avoiding liability is, although strictly not a defence, to deny what was disclosed was within the injunction in the first place. This would be by showing confidence had been lost by moving into the public domain, preventing further publication from causing substantial or any prejudice.