Are the affidavits the subject of the implied undertaking?
11 The immediate question is whether the affidavits are the subject of the implied undertaking, commonly referred to as the "Harman undertaking", a name which derives from Harman v Secretary of State for the Home Department [1983] 1 AC 280 (Harman). The leading Australian authority is Hearne v Street, in which Hayne, Heydon and Crennan JJ, with whom Gleeson CJ and Kirby J agreed, described the fundamental principle as follows (at 154 - 155 [96]):
Where one party to litigation is compelled, either by reason of a rule of court, or by reason of a specific order of the court, or otherwise, to disclose documents or information, the party obtaining the disclosure cannot, without the leave of the court, use it for any purpose other than that for which it was given unless it is received into evidence. The types of material disclosed to which this principle applies include documents inspected after discovery, answers to interrogatories, documents produced on subpoena, documents produced for the purposes of taxation of costs, documents produced pursuant to a direction from an arbitrator, documents seized pursuant to an Anton Piller order, witness statements served pursuant to a judicial direction and affidavits.
(Citations omitted).
12 Despite still being referred to as an implied "undertaking", the High Court in that case confirmed that it is a substantive obligation and one that can only be released by the Court: at 157 - 160 [105] - [107]. The corollary is that the "undertaking" cannot be released merely by the consent of the party which disclosed the relevant information or document. At the hearing of the present application, the respondent to the application somewhat belatedly acknowledged that leave was not required as the filing of the affidavits had not been compelled.
13 Although those principles are clear enough, recent authorities concerning the scope of the implied undertaking - as it applies to affidavits filed in a proceeding - diverge as to whether, and to what extent, a compulsory requirement to file an affidavit is necessary for the implied undertaking to arise with respect to the affidavit.
14 In Sinnott v Chief of Defence Force [2020] FCA 643 (Sinnott), Logan J considered an application by the Chief of Defence Force (the CDF) for leave to use an affidavit beyond the proceedings in which it had been filed. The relevant affidavit had been filed by Ms Sinnott in support of her application for judicial review and an application for an extension of time in which to bring that application. In reasons which were delivered ex tempore, his Honour considered that the affidavit had been "necessarily filed and served in support of the application for an extension of time", and referred to r 31.02(2) of the Federal Court Rules 2011 (Cth) which provides that such an application "must be accompanied by" an affidavit in support. Ultimately, his Honour considered himself bound by Liberty Funding Pty Ltd v Phoenix Capital Ltd (2005) 218 ALR 283 (Liberty Funding) and Hearne v Street to hold that the CDF was bound by an obligation not to use the affidavit other than for the purposes of the proceedings in which it had been filed: at [29].
15 That conclusion, being that the implied undertaking applies where the rules of court require an affidavit to be filed in support of an originating or interlocutory application which itself is voluntarily made, illustrates the broadest line of authority concerning the level of compulsion required for the implied undertaking to arise. However, Logan J also described that position as being "subject" to an underlying principle, described as follows by McPherson J in Central Queensland Cement Pty Ltd v Hardy [1989] 2 Qd R 509 (Central Queensland Cement) at 510:
… a document furnished for use for one purpose may not legitimately be used for another.
16 That principle, if it ever represented good law in Australia, would extend the implied undertaking beyond the circumstances considered in Sinnott to circumstances where no element of compulsion existed. Indeed, if an affidavit had been voluntarily furnished in one proceeding, that principle would make it impermissible for another party to rely upon it in other proceedings without the leave of the court. However, the correctness of that statement of principle has subsequently been doubted, at the very least because it pre-dates and is directly inconsistent with the authoritative statement of principle in Hearne v Street: see Frigger v Trenfield (No 5) [2020] FCA 827 [46].
17 In R v Silverstein [2020] VSCA 233 (Silverstein), the Victorian Court of Appeal (Kyrou, Kaye & McLeish JJA) considered an application for leave to appeal from a decision dismissing an application for contempt, in part arising from the respondents' alleged misuse of certain affidavits. Three of the affidavits had been filed in debt recovery proceedings brought by the applicant for leave, Mr Davey, against the second and third respondents, and he had filed the other in support of a preliminary discovery application. The first respondent, the solicitor for the second and third respondents, later sent the affidavits to Mr Davey's trustee in bankruptcy in an attempt to have the bankruptcy extended. Mr Davey then brought proceedings for contempt, in part on the basis that the respondents had breached the implied undertaking with respect to the affidavits by disclosing them to the trustee. Those charges were dismissed, with the primary judge concluding that the affidavits were not the subject of the undertaking.
18 In unanimously dismissing the application for leave to appeal, the Court of Appeal surveyed the relevant authorities concerning when documents are taken to have been filed, served or produced under "compulsion": at [58] - [91]. As the extracts from Harman set out in the Court of Appeal's reasons identify, the rationale for the implied undertaking is explained in terms of the need to limit the invasion of privacy where a party is compelled to disclose documents or information: Silverstein [61] - [62]. See also Hearne v Street at [107]; Esso Australia Resources Ltd v Plowman (1995) 183 CLR 10 at 33. The undertaking achieves this by limiting the use to which such documents or information may be put to that which is required by the course of justice, in general being their use in the relevant proceedings.
19 It is to be acknowledged that affidavits are specifically identified in Hearne v Street as a kind of document which attracts the implied undertaking. However, as the reasons of the Court of Appeal identify, the two cases cited by the High Court in support of that proposition concerned an affidavit in the nature of disclosure and an affidavit which had been ordered to be confidential: Silverstein at [74] - [76] discussing Medway v Doublelock Ltd [1978] 1 WLR 710 and Re Addstone Pty Ltd (in liq); Ex parte Macks (1998) 30 ACSR 156.
20 Turning to the issue before it, the Court of Appeal observed that the cases demonstrate that not every affidavit filed in compliance with a rule of court is produced under compulsion: at [78]. It doubted whether Liberty Funding supported the proposition applied in Sinnott that affidavits in support filed in accordance with a rule of court were sufficiently "compelled": at [83] - [84]. While it did not seek to define the precise limits of the principles concerning affidavits, it concluded that "the affidavits in question in this case fell well outside the scope of the kind of documents considered to have been provided under compulsion for the purposes of the principles discussed in the authorities": at [89]. Two of the affidavits filed in the debt recovery proceedings had been filed by Mr Davey in support of an application for summary judgment where the relevant rules of court required the application to be supported by an affidavit. Nevertheless, he was under no compulsion to make the application and, accordingly, the affidavits were held not to be the subject of the implied undertaking: at [85]. Likewise, Mr Davey was not compelled to make the application for preliminary discovery and the affidavit in support of that application was also not the subject of the implied undertaking: at [86]. The fourth affidavit, which had been filed by the second defendant in the debt recovery proceeding, was also filed voluntarily and thus was not the subject of the implied undertaking.
21 This Court is bound to follow the conclusions reached by the Court of Appeal in Silverstein: Farah Constructions Pty Ltd v Say-Dee Pty Ltd (2007) 230 CLR 89 at 151 - 152 [135]: with the consequence that it must be concluded that the affidavits filed in these proceedings are not the subject of any implied undertaking and that the second plaintiff does not require leave to rely upon them in the FCFCOA Proceedings. Nevertheless, it ought to be observed that, on one view, the Court of Appeal's decision appeared to emphasise the issue of whether the relevant originating or interlocutory application was made voluntarily, rather than on whether a party was compelled to file, serve or produce the specific documents or information in the relevant affidavit: see at [85] - [86]. The difficulty with the former approach is that it might be taken to follow that no documents or information which a party produces in the course of the proceedings (or in respect of an interlocutory application) which it brought voluntarily can be the subject of the implied undertaking, regardless of whether it was produced under compulsion of a rule or order of the court. Plainly, that would be wrong in the case of documents or information disclosed pursuant to an order requiring an applicant to produce specific documents or information, or specific categories of documents or information in proceedings it commenced voluntarily. Indeed, the quintessential case of compulsion is the production of documents as part of the process of disclosure or discovery.
22 Likewise, where a party is required by the rules of court or an order of the court to file and serve an affidavit deposing to specific information or categories of information, such an affidavit is in substance disclosure and would also be the subject of the implied undertaking. That may be contrasted with affidavits which are voluntarily made in support of an originating or interlocutory process. Even if the relevant rule of court requires such affidavits to be filed with or in support of the process, the specific information or documents included in the affidavits is not prescribed. The documents disclosed or information evidenced is a matter of the litigant's choice. The position seems to be the same where, as here, the rules of court requires the affidavit to state "the facts in support of the process". The information and documents included in the affidavits is nevertheless produced "voluntarily". The same is broadly true of affidavits filed in response to the relevant process.
23 For similar reasons, timetabling orders which require a party to file and serve any affidavits on which it intends to rely by a particular date, in general, do not compel the disclosure of the specific information or documents included in affidavits filed and served in compliance with such orders: Leagou Pty Limited v Commissioner of Taxation [2020] FCA 1162 [19] - [24]. In Helicopter Aerial Surveys Pty Ltd v Robertson [2015] NSWSC 2104, Brereton J doubted whether such orders constituted sufficient compulsion to attract the implied undertaking, but considered himself bound by Hearne v Street to conclude that it did: at [39] - [40].