DYK, Circuit Judge.

Powertech Technology Inc. ("PTI") filed a declaratory action seeking declarations of non-infringement and invalidity of Tessera, Inc.'s ("Tessera") United States Patent No. 5,663,106 ("'106 patent"). The United States District Court for the Northern District of California dismissed the action for lack of subject matter jurisdiction, finding no Article III case or controversy between the parties. Powertech Tech. Inc. v. Tessera, Inc., No. 10-00945, 2010 WL 2194829 (N.D.Cal. June 1, 2010). Because we conclude a controversy did exist, we reverse and remand for further proceedings on the merits.

BACKGROUND

I

A semiconductor chip ("chip") is a miniaturized electronic circuit that can be incorporated into larger electronic devices like cell phones and personal computers. A semiconductor package ("package") protects a delicate chip from mechanical and thermal damage by encapsulating it in molded plastic, generally referred to as an "encapsulant." The encapsulation process, however, can sometimes contaminate the delicate terminals on the exterior of the chip, preventing the terminals from connecting the package to other electronic components.

Tessera's '106 patent is a process patent that is directed to methods for preventing the contamination of exposed chip terminals during encapsulation. As illustrated below, the claimed process requires a protective barrier (30) which protects terminals (26) of the chip (12) from coming in contact with the encapsulant (40) when it is injected into the encapsulation area through a fill hole (36).

PTI is a Taiwanese sub-contracting company that packages chips for various customers in the semiconductor industry. PTI's customers send bare chips to PTI, and PTI encapsulates them in protective materials before returning the packaged chips to the customers. Notably, as the packager of the chips, PTI appears to be the only party in the supply chain to allegedly practice the method claims of the '106 patent (i.e., the encapsulation of the chip in protective materials). PTI's customers then incorporate the pre-packaged chips into downstream electronic products for marketing, selling, and importing worldwide, including in the United States. As discussed below, Tessera has alleged that PTI's encapsulation process is covered by the claims of the '106 patent.

Since the late 1990s, Tessera has licensed its technology to more than sixty semiconductor companies through agreements called Tessera Compliant Chip Licenses ("TCC Licenses"). Tessera and PTI entered into such an agreement on October 20, 2003, under which PTI agreed to pay running royalties in return for a license under the '106 patent (and other patents) to assemble, use, or sell certain "TCC Licensed Products." PTI claims it has complied with all of its obligations under the license agreement, including the obligation to pay royalties on a post-sale quarterly basis.

II

The current declaratory action stems partly from Tessera's allegations in two earlier suits—one before the United States International Trade Commission ("ITC proceedings or action") and one in the United States District Court for the Eastern District of Texas ("Texas action"). In the ITC action, Tessera sought relief under Section 337 of the Tariff Act of 1930, 19 U.S.C. § 1337, alleging infringement of the '106 patent and three other patents by eighteen defendants through the importation and sale of certain semiconductor chips. See In the Matter of Certain Semiconductor Chips with Minimized Chip Package Size and Products Containing Same (III), No. 337-TA-630, 2010 WL 686377 (Int'l Trade Comm'n Feb. 24, 2010) ("Final Determination"); In the Matter of Certain Semiconductor Chips with Minimized Chip Package Size and Products Containing Same (III), No. 337-TA-630 (Int'l Trade Comm'n Aug. 28, 2009) ("Initial Determination"). In the Texas action, filed on the same day as the ITC action, Tessera asserted infringement of the same patents, accusing the same defendants and products. Tessera's Complaint for Patent Infringement and Jury Demand, Tessera, Inc. v. A-DATA Tech. Co., No. 2:07-CV-534 (E.D.Tex. Dec. 7, 2007), ECF No. 1. As Tessera has conceded, the Texas action "is no different than the [ITC action] for present purposes." J.A. 432. The Texas action has been stayed pending the final outcome of the ITC proceedings. See 28 U.S.C. § 1659.

The accused products in the ITC and Texas actions were semiconductor chips that come in two formats: a first group consisting of so-called "wBGA" chips and a second group consisting of so-called "µBGA" chips.1 PTI is licensed by Tessera to manufacture both wBGA and µBGA chips. Though PTI was not a named party in either the ITC or Texas action, it maintains that some of the accused companies were customers who directly or indirectly purchased their wBGA and µBGA chips from PTI. For example, PTI asserts that three of the accused companies—Elpida Memory, Inc. ("Elpida"), Powerchip Semiconductor Corp., and ProMOS Technologies Inc.—used (and continue to use) PTI to package their chips, and that most of the other accused companies indirectly purchased PTI-packaged chips from these three companies or similar companies. In addition, PTI asserts that Kingston Technology Co. directly purchased packaged chips from PTI to incorporate into downstream electronic products.

In the Initial Determination of the ITC proceedings, the Administrative Law Judge ("ALJ") ruled that the '106 patent was not invalid and not infringed by the accused wBGA and µBGA products. The ALJ also determined that Tessera's patent rights were exhausted with respect to all accused products sold by Tessera's licensees, including PTI.2 In its Final Determination, the ITC affirmed the ALJ's determination that the wBGA products did not infringe, but it held that the µBGA products did infringe. The ITC did not, however, issue an exclusion order under Section 337 with respect to the µBGA products because it determined that Elpida was the only importer of µBGA chips and that all of Elpida's µBGA chips were purchased from licensed vendors, including PTI.

The ITC action culminated in our recent decision in Tessera, Inc. v. International Trade Commission, 646 F.3d 1357, 1361 (Fed.Cir.2011), where we affirmed the ITC's finding that there was no Section 337 violation. We held, inter alia, that (1) the '106 patent was not invalid as anticipated by three prior art references: U.S. Patent Nos. 5,136,336 ("Worp"); 5,218,759 ("Juskey"); and 4,868,349 ("Chia"); (2) the accused wBGA products did not infringe the '106 patent; and (3) though Elpida did not dispute that the µBGA chips infringed the '106 patent, we held that Elpida was nonetheless protected by a valid patent exhaustion defense, having purchased all of its products from licensed subcontractors, including PTI. Id. at 1366-67. We ultimately remanded the case back to the ITC, but the matters on remand are not pertinent to our current analysis. Id. at 1371.

III

While the ITC action was underway, PTI made royalty payments to Tessera for the wBGA products sold during the fourth quarter of 2009. These payments, however, were made "under protest" because PTI believed that the wBGA products did not infringe the '106 patent and that the '106 patent was invalid, and royalties were therefore not owed. Soon after, on March 5, 2010, PTI filed this declaratory action.

PTI's complaint in this action asserted two separate claims for relief. First, PTI sought a declaration that the "wBGA products [did] not infringe the '106 [p]atent." Complaint for Declaratory Judgment at 4, Powertech Tech. Inc. v. Tessera, Inc., No. 3:10-CV-00945 (N.D.Cal. Mar. 5, 2010), ECF No. 1. However, a similar declaration of non-infringement was not sought for PTI's µBGA products. Second, PTI sought a declaration that the '106 patent was invalid. Id. at 5. This claim for relief was not based on the same invalidity defense asserted by the defendants in the ITC action, in which the Worp, Juskey, and Chia references were used as anticipatory prior art. Instead, PTI alleged that the '106 patent was invalid based on other prior art raised in a pending reexamination of the '106 patent before the United States Patent and Trademark Office ("PTO"). There, the PTO examiner rejected original claims 1-4, 9, 10, 33 and 34 and newly submitted claims 48 and 50-52 as anticipated by European Patent Application No. 0,399,300 ("Tanaka"), a prior art reference that was not at issue in the ITC and Texas actions. The examiner also rejected original claim 35 and newly submitted claims 53-55 as obvious in light of Tanaka in view of various other pieces of prior art and rejected claims 56-59 as anticipated under § 102(e) by U.S. Patent No. 5,450,283 to Lin.3 Tessera's appeal before the Board of Patent Appeals and Interferences ("Board") is still pending as of the date of this decision.

In response to PTI's complaint in the current declaratory action, Tessera filed a motion to dismiss for lack of subject matter jurisdiction. According to Tessera, the ITC and Texas actions against PTI's customers could not create a controversy because, so long as PTI remained a licensee in good standing, PTI's customers would also enjoy protection against any infringement suit. Tessera contended that there was no controversy as to the royalty payments "so long as PTI [paid] the agreed upon royalties on the products defined as royalty bearing under the Agreement." J.A. 62. Tessera also argued that there was no controversy because, even if the '106 patent were found invalid or non-infringed, such an adjudication would not relieve PTI of its royalty obligations under the license agreement. This was so because PTI's royalty obligations did not turn on the validity or coverage of the '106 patent, but on an objective definition of the term "TCC Licensed Product" that would also cover the accused wBGA and µBGA chips.

On June 1, 2010, the district court granted Tessera's motion to dismiss for lack of subject matter jurisdiction. The district court held that PTI's products could not have been at issue in the ITC action because "PTI's products [were all] manufactured pursuant to a license with Tessera, which has explicitly excluded licensed products from its enforcement actions." J.A. 6. Additionally, the court concluded there was no actual controversy arising from the license agreement because the license agreement itself required PTI to pay royalties whether or not its products were covered by the '106 patent. Thus, any declaration of non-infringement or invalidity sought by PTI would not "redress any imminent injury [or] materially alter the status quo." J.A. 9. Finally, the court sua sponte held that, even if there were an actual controversy, the court would have declined to hear the case because judicial efficiency favored hearing the declaratory action along with the pending Texas action. PTI timely appealed when its motion for reconsideration was denied, and we have jurisdiction pursuant to 28 U.S.C. § 1295(a)(1).

DISCUSSION

I

We review the district court's dismissal for lack of subject matter jurisdiction de novo. Air Measurement Techs. Inc. v. Akin Gump Strauss Hauer & Feld, LLP, 504 F.3d 1262, 1267 (Fed.Cir.2007). The burden is on the party claiming declaratory judgment jurisdiction to establish that such jurisdiction existed at the time the claim for declaratory relief was filed. King Pharm., Inc. v. Eon Labs, Inc., 616 F.3d 1267, 1282 (Fed.Cir.2010); Benitec Austl., Ltd. v. Nucleonics, Inc., 495 F.3d 1340, 1344 (Fed.Cir.2007).

In MedImmune, Inc. v. Genentech, Inc., 549 U.S. 118, 132 n. 11, 127 S.Ct. 764, 166 L.Ed.2d 604 (2007), the Supreme Court rejected our prior, more stringent standard for declaratory judgment standing insofar as it required a "reasonable apprehension of imminent suit." See also, SanDisk Corp. v. STMicroelectronics, Inc., 480 F.3d 1372, 1378-79 (Fed.Cir.2007). Under the Court's new standard, an Article III case or controversy exists when "the facts alleged, under all the circumstances, show that there is a substantial controversy, between parties having adverse legal interests, of sufficient immediacy and reality to warrant the issuance of a declaratory judgment." MedImmune, 549 U.S. at 127, 127 S.Ct. 764 (internal quotation marks and citation omitted). The dispute must be "definite and concrete, touching the legal relations of parties having adverse legal interests," such that the dispute is "real and substantial" and "admi[ts] of specific relief through a decree of a conclusive character, as distinguished from an opinion advising what the law would be upon a hypothetical state of facts." Id. (internal quotation marks and citation omitted).

In Arris Group Inc. v. British Telecommunications PLC, 639 F.3d 1368, 1374 (Fed.Cir.2011), we recognized the requirement in MedImmune that there be an "adverse legal interest" for there to be declaratory judgment jurisdiction. This "adverse legal interest" required a "dispute as to a legal right—for example, an underlying legal cause of action that the declaratory defendant could have brought or threatened to bring." Id. "In the absence of such a legal controversy . . ., a mere adverse economic interest is insufficient to create declaratory judgment jurisdiction." Id. at 1374-75. We went on to conclude that a legal controversy did exist in Arris because the licensee—supplier of the product-at-issue—could incur potential legal liability for contributory infringement based on the patentee's infringement contentions against the licensee's customer:

Id. at 1375.

A

On appeal, PTI alleges that two controversies exist in creating declaratory judgment jurisdiction. First, it alleges that Tessera's allegations against its customers in the ITC and Texas actions create a controversy as to whether its wBGA and µBGA chips infringe the '106 patent, either because the chips are not within the scope of the claims (the wBGA chips) or because the '106 patent is invalid (the wBGA and µBGA chips). PTI argues that Tessera's pending claims of infringement in the ITC and Texas proceedings create a sufficient controversy because they directly implicate PTI's products and customers. Tessera maintains there is no controversy because all of PTI's products were "properly licensed" and categorically excluded from the enforcement of the '106 patent in the ITC and Texas actions. In particular, Tessera pointed to the following disclaimer in its ITC complaint, which stated that: "To the extent that any Accused Product is found to be properly licensed . . . under Tessera's patents, Tessera does not intend to bring—nor should Tessera be construed to have brought—any such Accused Product(s) within the scope of the present Investigation." Complaint Under Section 337 of the Tariff Act of 1930, as Amended, ¶ 9, In re Certain Semiconductor Chips With Minimized Package Size and Products Containing Same (III), Inv. No. 337-TA-630, 2007 WL 4349059 (Int'l Trade Comm'n Dec. 7, 2007) (emphasis added).

Tessera's position in the current action, however, is inconsistent with its arguments in the ITC action. There, Tessera maintained that products were only licensed and not-infringed if royalty payments were current. Because some licensees, including PTI, had allegedly underpaid their royalties or had paid them late, Tessera asserted that those sales were "unlicensed" and did not trigger exhaustion of its patent rights. These allegations created a controversy as to whether certain sales of PTI's products were unlicensed and infringing.

While we conclude that Tessera's allegations against PTI's customers with respect to infringement in the ITC and Texas actions created declaratory judgment jurisdiction,4 it is clear that resolution of that controversy is governed by our decision in Tessera. There, we ruled that "Tessera's patent rights [were] exhausted as to all products accused of infringing the '106 patent purchased from Tessera's licensees." Tessera, 646 F.3d at 1370-71. Relying on the Supreme Court's decision in Quanta Computer, Inc. v. LG Electronics, Inc., 553 U.S. 617, 635, 128 S.Ct. 2109, 170 L.Ed.2d 996 (2008), we held that patent exhaustion was, in fact, triggered "by an [initial] sale authorized by the patent holder." Id. at 1369. Because each of Tessera's TCC license agreements contained an unconditional grant of a license "to sell . . . and/or offer for sale" the accused products, we held that Tessera's licensees were authorized to sell the accused products when the TCC Licenses were initially granted. Id. at 1370. We therefore rejected Tessera's theory that previously-licensed products would become unlicensed when a licensee's royalty payments lapsed:

Id. at 1370. Although the resolution of the ITC action will not have preclusive effect on either the district court in Texas or the district court in this case,5 both courts are nonetheless bound by stare decisis to abide by any legal precedents established by our court in Tessera. See Tex. Instruments Inc. v. Cypress Semiconductor Corp., 90 F.3d 1558, 1568-70 (Fed.Cir.1996) (the denial of preclusive effect to ITC determinations does not allow district courts or subsequent panels of this court to "ignore holdings of this court that bear on cases before them"). In Tessera, we held that sales authorized under a license do not become unauthorized or infringing sales because a licensee subsequently delays royalty payments due under that license. 646 F.3d at 1370.

Because neither party disputes that PTI's wBGA and µBGA products are covered by the license agreement, to the extent Tessera's claims against PTI's customers arise from the same set of facts addressed in Tessera, the result we reached there would control equally here. Accordingly, we vacate the dismissal on jurisdictional grounds and remand with instructions to apply our decision in Tessera.

B

Second, PTI contends that a controversy exists as to PTI's continued obligation to pay royalties for the sales of its wBGA and µBGA chips under the license agreement with Tessera. In particular, PTI argues that the terms of the license agreement do not require it to pay royalties for the wBGA chips if those chips do not infringe or for the wBGA and µBGA chips if the patent is invalid. Tessera argues that royalty payments are due even if the products do not infringe the '106 patent and regardless of the patent's validity. Despite the existence of this dispute, Tessera appears to maintain that there can be no Article III controversy as long as PTI complies with all the terms of the license agreement, including the payment of royalties. In essence, Tessera's argument is that PTI must breach its license before it can challenge the validity of the underlying patent. This contention, however, is contrary to the Supreme Court's decision in MedImmune, in which the Court held that a licensee did not need to repudiate a license agreement by refusing to pay royalties in order to have standing to declare a patent invalid, unenforceable, or not infringed. 549 U.S. at 137, 127 S.Ct. 764; see also Altvater v. Freeman, 319 U.S. 359, 362, 63 S.Ct. 1115, 87 L.Ed. 1450 (1943). Like the petitioner in MedImmune, PTI is seeking to define its rights and obligations under its contract with Tessera. It need not repudiate its license agreement to do so. There is also no provision in the license agreement in which PTI has agreed not to argue non-infringement or invalidity. See MedImmune, 549 U.S. at 135, 127 S.Ct. 764.

Although the license agreement covers multiple patents, the key question appears to concern the '106 patent. In both the ITC and Texas actions, Tessera alleged that the wBGA products were covered by the unexpired '106 patent and two other patents that have now expired, U.S. Patent Nos. 5,679,977 and 6,133,627.6 Tessera made no claim that it could continue to collect royalty payments with respect to those expired patents. Tessera's claim to royalties on PTI's products thus appears to be tied directly to the '106 patent.

The parties devote considerable attention to the question of whether the terms of the license agreement require royalty payments to be tied to patent coverage or patent validity. They dispute whether the district court was correct as to the interpretation of that contract language. PTI also maintains that a condition of patent coverage and validity should be implied by legal necessity under California law. See Cal. Civ.Code §§ 1655-56 (stating that, under California contract law, any conditions that make a contract reasonable, conform it to industry usage, or are necessary to carry it into effect, are deemed implied unless the contract manifests a contrary intention); Stockton Dry Goods Co. v. Girsh, 36 Cal.2d 677, 227 P.2d 1, 3-4 (1951) (holding that an implied term exists when legal necessity justifies the implication). Relying on the Supreme Court's decision in Zenith Radio Corp. v. Hazeltine Research, Inc., 395 U.S. 100, 89 S.Ct. 1562, 23 L.Ed.2d 129 (1969), PTI argues that legal necessity compels an interpretation that royalty payments be tied to patent coverage or patent validity. PTI points out that conditioning the grant of a license on the payment of royalties on products which use the teaching of expired patents is patent misuse. See Brulotte v. Thys Co., 379 U.S. 29, 30, 85 S.Ct. 176, 13 L.Ed.2d 99 (1964); Beckman Instruments, Inc. v. Technical Dev. Corp., 433 F.2d 55, 61 (7th Cir.1970). Just as it would be patent misuse to require the payments of royalties on an expired patent, Brulotte, 379 U.S. at 30, 85 S.Ct. 176, PTI argues that it would be patent misuse to require payment of royalties for products that did not infringe or where the patents were invalid. Because a contract must be interpreted in a way that would make it lawful, see Cal. Civ.Code § 1643, PTI urges that there be an implied requirement for royalty-bearing products to fall within the scope of a valid patent.

On the other hand, Tessera argues that the Supreme Court in Zenith Radio rejected PTI's theory and held that a total sales royalty (i.e., a royalty based on a licensee's total sales of a product) "is not patent misuse, `even if, as things work out, only some or none of the merchandise employs the patented idea or process, or even if it was foreseeable that some undetermined portion would not contain the invention.'" Appellee's Br. at 48 (quoting Zenith Radio, 395 U.S. at 138, 89 S.Ct. 1562).

We need not decide whether PTI or Tessera is correct as to this issue. The merits of this dispute are not before us. No motion to dismiss for failure to state a claim or motion for summary judgment has been filed, and no discovery into the proper interpretation of the license agreement has been conducted.7 The Supreme Court in MedImmune made clear that, in almost identical circumstances, the issue of contract interpretation is a merits issue, not appropriate to decision on a motion to dismiss under Rule 12(b)(1). 549 U.S. at 135-36, 127 S.Ct. 764 ("[E]ven if respondents were correct that the licensing agreement . . . precludes this suit, the consequence would be that respondents win this case on the merits—not that the very genuine contract dispute disappears, so that Article III jurisdiction is somehow defeated."). Here, we simply hold that the dispute between PTI and Tessera—as to whether the license agreement requires royalty payments to be tied to valid patent coverage—is sufficient to support declaratory judgment jurisdiction. We leave the merits-based arguments to the district court to consider on remand.

II

Finally, we address the propriety of the district court's alternative ground for dismissal. The district court sua sponte held that, even if PTI had established an actual controversy, the court would nonetheless dismiss the case because "the interests of judicial efficiency would favor hearing PTI's declaratory judgment action along with [the pending Texas action]." Powertech, slip op. at 9. On appeal, PTI argues that the district court abused its discretion by ignoring the forum selection clause in the license agreement. This clause stated that "if either party files a claim in a state or federal court, such claim shall be filed in the state or federal courts in California." J.A. 110. In M/S Bremen v. Zapata Off-Shore Co., 407 U.S. 1, 10, 92 S.Ct. 1907, 32 L.Ed.2d 513 (1972), the Supreme Court held that a forum-selection clause is "prima facie valid and should be enforced unless enforcement is shown by the resisting party to be `unreasonable' under the circumstances."8 Moreover, Ninth Circuit law requires that, in considering the dismissal of a case, forum selection clauses should be enforced unless there is a strong public policy against doing so. Jones v. GNC Franchising, Inc., 211 F.3d 495, 497-98 (9th Cir. 2000) (citing M/S Bremen, 407 U.S. at 1, 92 S.Ct. 1907); Docksider, Ltd. v. Sea Tech., Ltd., 875 F.2d 762, 763-64 (9th Cir. 1989). In Docksider, the Ninth Circuit held that "[w]here venue is specified with mandatory language, the clause will be enforced." 875 F.2d at 764. The forum selection clause there used mandatory "shall" language to designate Virginia as the proper forum, stating that "[v]enue . . . shall be deemed to be in . . . Virginia." Id. at 763 (emphasis added). Here, the forum selection clause in PTI's license agreement employs similar "shall" language to mandate jurisdiction in California. It is clear that the district court erred in failing to enforce the forum selection clause.

Other special circumstances also suggest that the forum selection clause should be enforced. Here, the choice-of-law provision in the license agreement manifests the parties' intent that the license agreement be "governed, interpreted and construed in accordance with the laws of the State of California." J.A. 110. Furthermore, the district court in California is already entertaining multiple declaratory actions related to the '106 patent, including Siliconware Precision Industries Co. v. Tessera, Inc., No. 4:08-cv-03667 (N.D.Cal.); ChipMOS Technologies, Inc. v. Tessera, Inc., No. 4:08-cv-03827 (N.D.Cal.); and Advanced Semiconductor Engineering Inc. v. Tessera Inc., No. 4:08-CV-03726 (N.D.Cal.).9 Nothing suggests that a Texas court would confer any additional conveniences with respect to the availability of evidence or potential witnesses, nor has Tessera provided adequate cause to override PTI's choice of forum. We therefore hold that it was an abuse of discretion for the district court to refuse jurisdiction over this action.

III

For the foregoing reasons, the district court's dismissal of the declaratory judgment action is reversed. We remand for proceedings consistent with this opinion.

REVERSED and REMANDED