[26] Confidentiality is not ordinarily a sufficient reason to deny inspection by the opposite party as the implied undertaking that the documents be used only for the purpose of the litigation will provide sufficient protection to the party producing them. However, other considerations arise where the documents in question are commercially sensitive and the relevant parties are trade rivals.
[27] In this context, when it is said that the information is 'commercially sensitive', what is meant is that 'a rival in the market place who obtains access to it may turn the material to the advantage of that rival and to the disadvantage of the party who seeks to keep it secret'.
[28] Where the relevant parties are trade rivals, and the documents in question contain confidential and commercially sensitive information, the court must strike a fair balance between the legitimate concerns of the party discovering the documents and the needs of the other party to the litigation.
[29] In relation to the court's duty to strike a fair balance, Hayne JA in Mobil Oil[3] observed:
Where, as here, the problem is one of balancing the needs of a party to the litigation and the legitimate concern of a trade rival to retain secrecy of commercially sensitive information, it may well be necessary to mould orders that will distinguish between the plaintiff, its officers, its legal advisers and experts. Again it may be accepted that generally a party is entitled to inspect the documents of an opposite party by itself its servants or its agents. But in the present kind of case, is it necessary to destroy the legitimate claim to confidentiality from trade rivals by permitting the principal of that rival to look at the documents? Is it sufficient to permit counsel and solicitors (and nominated experts) to do so? It is now commonplace in the courts for material to be made available only to the legal advisers of the parties and nominated experts. Of course such arrangements bring with them their own difficulties and are arrangements that should be adopted only where there is a need to do so; of course they are arrangements that may need to be reviewed as the matter progresses towards trial or as the trial itself proceeds. But they are arrangements that are made and should be made when doing so would strike a fair balance between the competing interests of the party seeking inspection and the party claiming confidentiality. No more specific rule can be laid down each case will fall for determination according to its own facts. In particular the nature and the content of the disputed documents is a matter that will usually, if not invariably, be of great importance in forming a conclusion and, if that is so, it will be appropriate for the judge to inspect the documents concerned (39 40).
[30] Some of the relevant matters in assessing whether a document should attract additional protection beyond the protection of the implied undertaking include the age of the information, the identity of the persons who will inspect the documents, and the reason or reasons why the inspection of particular documents is necessary ... More generally, a relevant factor is the degree of commercial sensitivity involved and the extent of any prejudice to the party giving discovery.
[31] The striking of a fair balance may need to be revisited as the matter progresses to trial.