II
Defendants initially challenge the district court's grant of permissive intervention under Fed.R.Civ.P. 24(b). Of course, permissive intervention is a matter within the sound discretion of the district court, and we will not disturb its order except upon a "showing of clear abuse."
Shump v. Balka, 574 F.2d 1341, 1345 (10th Cir.1978).
The courts have widely recognized that the correct procedure for a non-party to challenge a protective order is through intervention for that purpose. Public Citizen v. Liggett Group, Inc., 858 F.2d 775, 783 (1st Cir.1988), cert. denied, - U.S. , 109 S.Ct. 838, 102 L.Ed.2d 970 (1989). When a collateral litigant seeks permissive intervention solely to gain access to discovery subject to a protective order, no particularly strong nexus of fact or law need exist between the two suits. Meyer Goldberg, Inc. v. Fisher Foods, Inc., 823 F.2d 159, 164 (6th Cir.1987). Here, the district court allowed intervention on a finding that interpretation of the EIL policies was a common issue between the instant case and the other suits. This was a sufficient basis.
Defendants argue that intervention three years after a case has settled is precisely the sort of undue delay and prejudice that Rule 24(b) prohibits. While it is true that an application for intervention must be timely, "[t]imeliness is to be determined from all the circumstances," and "the point to which the suit has progressed ... is not solely dispositive." NAACP v. New York, 413 U.S. 345, 365-66, 93 S.Ct. 2591, 2603, 37 L.Ed.2d 648 (1973). The most important circumstance in this case is that intervention was not on the merits, but for the sole purpose of challenging a protective order. Rule 24(b)'s timeliness requirement is to prevent prejudice in the adjudication of the rights of the existing parties, a concern not present when the existing parties have settled their dispute and intervention is for a collateral purpose. See Public Citizen, 858 F.2d at 786-87; Meyer Goldberg, 823 F.2d at 161-62. We find nothing improper in allowing intervention to challenge a protective order still in effect, regardless of the status of the underlying suit.
III
Defendants also object to the district court's modification of the protective order. As long as a protective order remains in effect, the court that entered the order retains the power to modify it, even if the underlying suit has been dismissed. See Public Citizen, 858 F.2d at 781-82; In re "Agent Orange" Prod. Liab. Litig., 821 F.2d 139, 145 (2d Cir.), cert. denied, 484 U.S. 953, 108 S.Ct. 344, 98 L.Ed.2d 370 (1987). And modification of a protective order, like its original entry, is left to the discretion of the district court. See Wyeth Laboratories v. United States District Court, 851 F.2d 321, 323 (10th Cir.1988).
The protective order in this case was entered by stipulation of the parties and designated all materials produced in discovery as confidential. The order restricted use and disclosure unless a party challenged the confidentiality of a particular item. These stipulated "blanket" protective orders are becoming standard practice in complex cases. See Manual for Complex Litigation, Second, § 21.431 (1985). They allow the parties to make full disclosure in discovery without fear of public access to sensitive information and without the expense and delay of protracted disputes over every item of sensitive information, thereby promoting the overriding goal of the Federal Rules of Civil Procedure, "to secure the just, speedy, and inexpensive determination of every action." Fed.R.Civ.P. 1; see generally In re Alexander Grant & Co. Litig., 820 F.2d 352, 356-57 (11th Cir.1987); Marcus, Myth and Reality in Protective Order Litigation, 69 Cornell L.Rev. 1, 9-11 (1983),
No doubt such an order makes the discovery process in a particular case operate more efficiently; the assurance of confidentiality may encourage disclosures that otherwise would be resisted. Allowing modification of protective orders for the benefit of collateral litigants tends to undermine the order's potential for more effi