Opinion for the Court filed by Circuit Judge ROGERS.
Appellants Jack and Robin Lavin appeal from an order enforcing a subpoena for seven taped telephone conversations that they maintain are protected from disclosure by the privilege for confidential marital communications. The district court rejected the Lavins’ claim of privilege, finding that their communications were not confidential and that, even if initially confidential, the Lavins waived the right to assert the privilege. The Lavins contend that the district court’s finding that their conversations were not confidential was unsupported by the evidence, and that the district court erred in denying then-request for discovery on the disputed issue of the confidentiality of their conversations. The Lavins also contend that the district court’s finding of waiver of the privilege was erroneous as a matter of law insofar as the court based its conclusion on their failure to secure physical possession of all copies of their taped conversations and on the inclusion in their pleadings of an excerpt from the conversations. We hold that because the record was insufficiently developed to determine whether the communications were confidential, the district court erred in limiting discovery on the issue of confidentiality. We also hold that the Lavins took all reasonable steps to protect the confidentiality of their conversations, and thus did not waive the right to assert the privilege. Accordingly, we reverse and'remand the case to the district court to permit the Lavins discovery.
I.
On June 30, 1995, the Securities and Exchange Commission (“SEC”) issued a subpoena duces tecum to Mr. Lavin as part of its ongoing investigation, commenced in June 1994, into fraudulent sales practices in derivative securities at Bankers Trust Company (“Bankers Trust” or “the bank”) and BT Securities Corporation .(“BT Securities”), a broker-dealer registered with the SEC. 1 The subpoena sought production of tape recordings of seven conversations that Mr. La-vin had with his wife from mid-June to mid-July 1994. By the time it sought the Lavins’ conversations, the SEC had already obtained from the bank over 5,000 tape-recorded conversations of bank employees involved in selling derivatives. In December 1994, the SEC reached a settlement with the bank but continued its investigation of certain BT Securities employees.
At the time of the conversations, Mr. Lavin was a managing director of BT Securities and head of its U.S. Corporate Capital Markets Group, which sold derivatives to corporate customers, and was head of BT Securities’ Chicago office. Until January 1994, Mr. Lavin had worked at BT Securities’ main office in New York. There, he had a desk on a trading floor, and, consistent with the New York office’s policy, the telephone on his trading desk was taped. He also shared a personal office in New York and conversations on his office telephone were not taped.
Before Mr. Lavin’s appointment in January 1994 as head of the BT Securities’ Chicago office, that office dealt primarily in corporate financings and did not have a taping system for its telephone calls. With the arrival of Lavin’s derivatives group, Mr. La-vin decided that the Chicago office should have a system for the routine taping of tele *924 phone calls with its customers. The taping system was put in place between February and April 1994, and it recorded the seven conversations between Mr. and Mrs. Lavin. Whether Mr. Lavin had originally arranged for the telephones of all three persons engaged in selling derivatives, including himself, to be recorded, or whether he had requested all those lines except his private line in his office to be recorded was in dispute. Mr. Lavin claimed the latter instruction was the one he gave, and testified that as soon as he became aware of the tape recording of the conversations on his private line, he ordered the taping stopped. It is undisputed that by September 2, 1994, pursuant to Mr. Lavin’s instructions, the tape recording of his private office line had ceased.
In mid-November 1994, Mr. Lavin’s counsel was notified by Bankers’ Trust’s counsel that copies of the tapes of the Lavins’ seven conversations had been provided as part of a production of several thousand tapes earlier that month to the Federal Reserve Bank of New York in response to a request made pursuant to the Federal Reserve’s examination powers. 2 Mr. Lavin’s counsel immediately alerted Bankers Trust and its counsel that the Lavins were asserting the confidential marital communications privilege as to the conversations between Mr. and Mrs. La-vin, and requested that the bank take all steps necessary to preserve the privilege. Consistent with this request, Bankers Trust asserted the marital privilege to the Federal Reserve on behalf of the Lavins as part of a privilege list on which Bankers Trust asserted its own privileges with respect to the thousands of tapes provided to the Federal Reserve. The Lavins also secured an agreement with Bankers Trust that it would provide them with notice and an opportunity to seek judicial relief prior to any further disclosure of the tapes. Thereafter, in January 1995, the Lavins formally requested that Bankers Trust return all copies of the tapes to the Lavins; the bank denied the request on the grounds that there were outstanding document requests and subpoenas for the production of the tapes, but confirmed its intention to abide by its agreement with the Lavins.
In January 1995, the SEC learned that Bankers Trust had withheld production of the seven Lavin tapes from previously produced materials because of the Lavins’ claim of privilege. Four months later, the SEC deposed Mr. Lavin on the circumstances surrounding the making of the tapes, and also conducted four ex parte investigatory depositions of BT Securities personnel. After the Lavins denied its renewed request for the tapes, the SEC served a subpoena on Mr. Lavin for production of the tapes. 3 Following the Lavins’ formal objection to production on the ground of the confidential marital communications privilege, the SEC, on November 9, 1995, applied to the district court for an order enforcing its subpoena, and Mrs. Lavin intervened in the proceeding.
Meanwhile, the issue of the Lavins’ privilege also arose in a civil suit brought against Bankers Trust and BT Securities by one of their derivatives customers.
See Procter & Gamble Co. v. Bankers Trust Co.,
Subsequently, the district court here ordered the SEC’s subpoena to be enforced.
SEC v. Lavin,
II.
The federal common law recognizes two types of marital privileges: the privilege against adverse spousal testimony and the confidential marital communications privilege. The former allows a spouse called as a witness against his or her spouse in a criminal proceeding to refuse to testify,
see Trammel v. United States,
The confidential marital communications privilege may be asserted against the production of evidence when four prerequisites are met: (1) there must have been a communication,
see Pereira v. United States,
A.
“[Sjubpoena enforcement proceedings must be adversarial in character and ... afford an adequate opportunity to raise all objections to (the) administrative subpoena.”
FTC v. Atlantic Richfield Co.,
In the district court the Lavins argued that if the court concluded that the SEC’s inadmissible hearsay evidence raised disputed issues of fact that precluded the Lavins’ assertions of the privilege, the Lavins should be allowed several days to conduct discovery. Specifically, the Lavins sought to depose and cross-examine the BT Securities’ ■witnesses relied on by the SEC, and to depose one or two other persons with knowledge of the circumstances that led to the taping in Chicago. On appeal the Lavins contend that the district court applied the wrong legal standard in denying discovery, focusing on whether the Lavins demonstrated a lack of institutional good faith by the SEC in its investigatory policies instead of on whether the circumstances indicated that additional information was necessary for the court to be in a position to evaluate their privilege claim. The Lavins also contend that the district court abused its discretion by treating the discovery request as part of a “run-of-the-mill” subpoena enforcement proceeding because denial of the requested discovery deprived them of the only means by which they could have developed their side of the story. We agree that the district court abused its discretion. 4
The district court relied on
Resolution Trust Corp. v. Frates,
As an additional ground for denying the Lavins’ discovery request, the district court concluded that “there [was] adequate evidence to decide all issues of credibility and to reach a well-informed result.” Id. However, the evidence regarding whether Mr. Lavin knew or should have known that his telephone was being recorded was sufficiently in dispute that the court could not properly rely on ex parte depositions of employees of BT Securities and ambiguous taped remarks made by Mr. Lavin. Especially because Mr. Lavin’s claim that the evidentiary discrepancies resulted from confusion and miscommunication surrounding the issue of taping in Chicago offered a possible explanation for inconsistencies in the testimony of BT Securities personnel, the circumstances warranted granting the Lavins’ discovery request.
In concluding that the evidence was adequate to resolve the disputed issue of the confidentiality of the tapes, the district court relied in large part on the
ex parte
deposition testimony obtained by the SEC from four bank employees: Sal Iannuzzi, Michael Ugliarolo, Art Vallette, and David Mellon.
Lavin,
The district court also found that Mr. La-vin’s “own words and actions” demonstrated that he knew that his telephone conversations were being recorded.
Id.
In maintaining that he had no knowledge of the recording, Mr. Lavin stated by affidavit that he had had a meeting with two bank employees, Iannuzzi and Melvin Yellin, where it was expressly decided that .Mr. Lavin’s private line would not be taped. When questioned by the SEC, Iannuzzi testified that he had no recollection of such a conversation, but also acknowledged that his memory concerning the details of the taping procedures was “extremely weak” and “really hazy.” Yellin, Bankers Trust’s Assistant General Counsel, had not been deposed by the SEC, and the Lavins neither presented, nor represented that they had sought, his testimony. In denying the Lavins’ request for discovery, the district court found it “significant ]” that the Lavins failed to offer any proof from Yellin confirming that the conversation described by Mr. Lavin had actually taken place.
Lavin,
Mr. Lavin’s recorded statements from telephone conversations during the relevant time period also did not provide a basis for the district court’s finding of adequate evidence to determine that the conversations at issue were not privileged. An April 4, 1994, conversation between Lavin in his Chicago office and a New York-based marketer suggested that Mr. Lavin did not believe his line to be taped. Mr. Lavin asked the marketer to place a telephone conference call to a customer, stating: “[Y|ou dial because I want it to be taped.” Another taped telephone conversation, on July 19, 1994, arguably points to the opposite conclusion. In referring to a telephone call that he had made about thirty minutes earlier from his Chicago office, Mr. Lavin stated to an associate, “I want to actually get a copy of this tape.” The SEC’s reconciliation of the two conversations, that the prior statement in April is not inconsistent with Mr. Lavin’s knowing of the taping by July, might be persuasive but for Mr. Lavin’s statement to his wife on July 21, 1994. Then, in response to Mrs. Lavin’s question, “The phone call is being taped?,” Mr. Lavin answered, “This line is not taped.”
As further grounds in support of their discovery request, the Lavins presented additional evidence supporting Mr. Lavin’s asserted lack of knowledge of the taping. First, the claim that his telephone in his private office in Chicago was not supposed to be tape recorded was consistent with the undisputed fact that his private office telephone in his New York office was not taped. Second, Vallette testified that Mr. Lavin appeared to be “surpris[ed]” upon learning that his conversations had been recorded. Third, the undisputed fact that Mr. Lavin, upon learning of the taping from Vallette, asked for the taping to stop tends to corroborate the Lavins’ claim that Mr. Lavin had not intended that his telephone line be taped, and that he was previously unaware that it was being taped. Indeed, the Lavins’ characterization of events, that Mr. Lavin’s telephone was erroneously included among the telephones on which the.taping system was installed, is at this point the account that best explains the contradictory evidence before the district court.
Consequently, in view of the conflicting nature of the evidence regarding Mr. Lavin’s knowledge of the taping, we hold that the district court erred in denying the La-vins’ discovery request. A claim of privilege must be “presented to a district court with appropriate deliberation and precision” before a court can rule on the issue,
see Friedman v. Bache Halsey Stuart Shields, Inc.
B.
The question remains whether, even if their communications were initially made in confidence, the Lavins subsequently waived the confidential marital communications privilege and the district court thus properly ordered enforcement of the SEC’s subpoena for the taped conversations. The district court concluded on two independent grounds that the Lavins had waived the privilege, pointing to their failure to obtain physical possession of the copies of the tapes that were in possession of other entities, and to their selective disclosure of the privileged materials in litigation.
5
Lavin,
The district court first concluded that the Lavins’ conduct was inconsistent with zealous protection of confidential marital communications because Bankers Trust, its counsel, and the Federal Reserve Bank continue to have “unfettered access” to copies of the seven tape recordings, and the Lavins, after asserting the privilege in mid-November 1994, waited until January 1995 to request that Bankers Trust turn over the tapes, and have never taken legal action to compel the bank to turn over the tapes or to destroy them.
Lavin,
In the attorney-client context, this court adheres to a strict rule on waiver of privileges.
6
“[T]he confidentiality of communications covered by [a] privilege must be jealously guarded by the holder of the privilege lest it be waived.”
In re Sealed Case,
However, the question of the Lavins’ alleged waiver arises in an unusual context, different from that of any of the cases on which the district court and the parties rely. The Lavins assert the privilege with regard to communications, the physical manifesta
*930
tions of which belong to a third party, Mr. Lavin’s employer. Consequently, the cases cited that discuss implied waiver when the holder of the privilege or his attorney is in possession of the materials at issue and fails to take adequate precautions to maintain their confidentiality,
7
ie.,
negligent or inadvertent disclosures, offer limited guidance on whether disclosures by third parties over whom the holder of the privilege has virtually no control,
ie.,
involuntary disclosures, may nonetheless be held to constitute waiver. In eases of involuntary disclosure, at least one court has held that waiver occurs only when the holder has failed to take reasonable steps to reclaim the protected material. Thus, in
De La Jara,
on which the district court relied, the Ninth Circuit upheld the finding of waiver where the police, in executing a search warrant, seized a letter written by the defendant to his attorney and, during the six-month period between the seizure and the introduction of the letter at trial, the defendant failed to avail himself of various legal means (such as filing a motion to suppress the letter under Federal Rule of Criminal Procedure 12(b)(3), or a motion for return of property under Federal Rule of Criminal Procedure 41(e)) that would have enabled him to claim the privilege or even perhaps recover his property.
[W]hen the disclosure of privileged material is involuntary, we will find the privilege preserved if the privilege holder has made efforts ‘reasonably designed’ to protect and preserve the privilege. Conversely, we will deem the privilege to be waived if the privilege holder fails to pursue all reasonable means of preserving the confidentiality of the privileged matter.
In our view the Ninth Circuit’s standard with regard to involuntary disclosures strikes the proper balance between the conflicting policies of facilitating truth-seeking by construing privileges strictly and, at the same time, fairly and adequately “proteet[ing] the privacy of marriage and encouraging] open and frank marital communications.”
United States v. Sims,
Applying the Ninth Circuit’s approach here, we conclude that the Lavins took all reasonable steps to protect their taped conversations from disclosure and thus did not waive the privilege. Contrary to the district court’s conclusion, the Lavins were not obligated to take any legal action during the *931 period from early September 1994, when Mr. Lavin knew that some of his conversations were taped, until mid-November, when the Lavins did assert their privilege. Unlike De La Jara, where the defendant had reason to be aware of the threat that his letter would be used in the prosecution against him, as well as ample opportunities under the Federal Rules of Criminal Procedure to assert the attorney-client privilege prior to the introduction of his letter into evidence, until the Lavins were first notified by Bankers Trust that copies of the tapes had been turned over to the Federal Reserve Bank of New York, there was no event that should have triggered their assertion of the privilege. The fact that Mr. Lavin knew no later than September 1994 that his telephone line had been routinely recorded for the past five to seven months did not mean that he was obligated at that time to try to recollect all of the conversations that he had with his wife on that line and assert the privilege in a vacuum, anticipating production requests by third parties. Even if Mr. Lavin could have foreseen that third parties might eventually seek to examine the tapes, we know of no case, and the SEC points to none, that requires a privilege holder to engage in a preemptive strike to prevent further disclosure of involuntarily disclosed, privileged materials — in other words, to assert the privilege or institute other legal measures absent a concrete threat of further disclosure. 11
The inadvisability of adopting an affirmative duty is clear given the difficulties that arise in determining what would constitute sufficient preemptive measures, as well as the unfairness and wastefulness of requiring the privilege holder to take affirmative action likely to prove unnecessary or ineffective. Rules of privilege are designed to afford its holder the right to protect himself or herself against the use of privileged materials in legal proceedings; they do not, as Professor McCormick points out in his treatise, “speak directly to the question of unauthorized revelations of confidential matter outside the judicial setting.” 1 McCormick § 72.1, at 271-72. Bankers Trust maintained the tapes primarily for the purpose of resolving trading disputes with customers. Had there been a customer complaint that required examination of his conversations with his wife, Mr. Lavin reasonably could have expected to have been afforded the opportunity by the Bank to review the tapes of his conversations — much as he was in fact later afforded this opportunity — and at that point decide whether to assert any privilege. Here, as soon as Bankers Trust alerted Mr. Lavin in mid-November of the Federal Reserve’s examination, the Lavins asserted the privilege, and they were under no obligation to have done so earlier. 12
Upon learning that the tapes had been sought by and delivered to the Federal Reserve Bank, the Lavins immediately asserted the privilege against all three entities in possession of the tapes: Bankers Trust, Bankers Trust’s counsel, and the Federal Reserve Bank. In addition, they secured an arrangement whereby Bankers Trust would provide them with notice and an opportunity to object before it would produce copies of the tapes in response to any discovery requests. Thereafter, when Bankers Trust denied the Lavins’ request to turn over the tapes because of outstanding subpoenas and document requests, the Lavins reconfirmed their assertion of the privilege and received assurances that their agreement concerning disclosure to third parties would be respected. Pursuant to this agreement, after receiving notice that Procter & Gamble sought the tapes in connection with its civil litigation against Bankers Trust, the Lavins immediately asserted the privilege and intervened in that case to preclude the tapes’ production. The tapes have not been produced to any other parties. Hence, the district court erred in finding that third parties continued
*932
to have “unfettered access” to the tapes of the Lavins' conversations at the time of the district court’s ruling,
Lavin,
The fact that the Lavins did not institute formal legal proceedings to gain physical possession of the tapes is irrelevant. The existence of a legally cognizable privilege has no bearing on the ownership of a document or recording; it simply determines whether the information contained in such materials should be subject to disclosure in a legal proceeding.
Cf.
McCormick § 72.1, at 271-72. Regardless of whether the Lavins “possibly,” as the SEC suggests, might have been able to bring an action under the federal wiretap statute to order Bankers Trust to erase or destroy the tapes,
see
18 U.S.C. §§ 2520, 2521,
13
the Lavins took reasonable action to protect the confidentiality of the conversations by asserting the privilege as soon as there was a threat of further disclosure to third parties;
14
taking reasonable precautions to preserve the confidentiality of privileged materials does not require gaining physical possession in cases such as this where the disclosure was completely involuntary and, in any event, attempts to gain such possession would have been futile because the tapes were not the property of the La-vins. Under these circumstances, it was sufficient for the Lavins to assert the privilege as soon as they were notified of the requests for the tapes by the Federal Reserve, and to assert the privilege here and in other litigation. Unlike the party in
Permian Corp.,
Bankers Trust and its counsel’s initial review of the tapes also did not constitute waiver by the Lavins; there were numerous reels of tape recordings of telephone conversations held by Bankers Trust, and only because these entities were able to examine the tapes did the Lavins learn which tapes contained their conversations and have the opportunity to claim that they were privileged.
Cf. Transamerica Computer,
Finally, Bankers Trust’s production of the Lavins’ tapes, which were included among several thousand other tapes, to the Federal Reserve Bank of New York also did not constitute waiver by the Lavins. Bankers Trust produced the tapes for the Federal Reserve, not pursuant to a subpoena, but in response to the Federal Reserve’s exercise of its examination powers. See 12 U.S.C. *933 § 325. At that time, neither Bankers Trust nor its counsel had reviewed any of the thousands of tapes to determine whether they contained privileged communications. In connection with production of the tapes, however, Bankers Trust provided the Federal Reserve with a list of all tapes for which the bank was asserting a privilege. On this privilege list, Bankers Trust asserted the marital privilege on the Lavins’ behalf. The Lavins thus asserted the marital privilege against the Federal Reserve as soon as it was reasonably possible to do so.
The district court’s second ground for finding waiver, that the Lavins waived the privilege by making a selective disclosure in their pleadings in the district court, fares no better. It is true that any disclosure by a holder of a privilege inconsistent with maintaining the confidential nature of marital communications waives the privilege.
See In re Sealed Case,
In attempting to demonstrate that, at the time of their telephone conversations, they understood their communications to be confidential, the Lavins submitted to the district court for in camera review transcripts of the seven taped conversations. 15 In a Memorandum in Opposition to the SEC’s Application for Enforcement, the Lavins referred the district court to the following excerpt from one of the conversations at issue as evidence of the Lavins’ contemporaneous understanding that their telephone conversations were not being taped and were thus private and confidential:
Mr. Lavin: “This line is not taped.”
Mrs. Lavin: “No.”
Mr. Lavin: “No....”
The Lavins contend that this disclosure did not constitute a waiver of their privilege, and we agree.
The prohibition against selective disclosure of confidential materials derives from the appropriate concern that parties do not employ privileges both as a sword and as a shield. The purpose of the privilege is to protect the confidentiality of marital communications: “[it] is intended only as an incidental means of defense and not as an independent means of attack, and to use it in the latter character is to abandon it in the former.”
In re Sealed Case,
Accordingly, we reverse the order enforcing the subpoena and remand the case to the district court to allow the Lavins to conduct discovery as the court shall direct, and to *934 determine thereafter whether the Lavins may assert the privilege. If the court concludes that Mr. Lavin may not assert the privilege, the Lavins may appeal that determination as well as the district court’s prior resolution of Mrs. Lavin’s independent claim of privilege.
Notes
. Bankers Trust and BT Securities are wholly-owned subsidiaries of Bankers Trust New York Corporation.
. • See 12 U.S.C. § 325.
. The SEC and the Lavins agreed that the tapes would be deemed to be in Mr. Lavin’s possession, custody, and control for purposes of his response to the subpoena. The SEC sought to litigate the privilege issue without having to proceed directly against the bank.
. Because the district court erred in denying the Lavins' discovery request, we do not reach the Lavins’ contentions that the district court erred in finding that Mr. Lavin knew his telephone conversations were being recorded, erred in applying the wrong legal standard in denying their request for a hearing, and denied them due process by refusing them discovery while relying on their failure to provide supportive testimony as a basis for its finding that the communications were not confidential.
. In so ruling, the district court "[a]ssum[ed]
arguendo
that the privilege would attach and that Mrs. Lavin could assert the privilege independent of her husband.”
Lavin,
.
See generally Gray v. Bicknell,
.
See De La Jara,
. See
Transamerica Computer Co. v. IBM,
. The Federal Rules of Evidence acknowledge that the law of privileges should not remain frozen but instead adjust to changing circumstances in light of reason and experience.
See Trammel v. United States,
. See Natalie A. Kanellis, Comment, Applicability of the Attorney-Client Privilege to Communications Intercepted by Third Parties, 69 Iowa L.Rev. 263, 270-71 (1983).
. By contrast with
Permian Corp.,
. The SEC points to no evidence in the record showing that, before the Lavins' assertion of the privilege, anyone had listened to the Lavins' taped conversations other than in connection with production requests made to the bank by the Federal Reserve Bank and the SEC.
. The Lavins contend that such a remedy was unavailable because, in order to seek relief under the wiretap statute, the interception must have been ''willful” and not, as the Lavins maintain in the instant case, the result of inadvertence or mistake. In light of our conclusion that the privilege claim does not rise or fall on whether the Lavins filed a lawsuit to obtain possession or destruction of the tapes, we have no occasion to decide whether such a lawsuit would have been available to the Lavins under the wiretap statute.
. The record suggests that Mr. Lavin’s control over and access to the taped conversations at issue was limited. Mr. Ugliarolo, a managing director at Bankers Trust, for example, testified that Mr. Lavin did not have authority to stop the taping once it started. Also, the seven taped conversations were not in the form of separate cassettes, but were embedded in large reels of tape containing many conversations over many months.
. Citing
In re Sealed Case,
