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DoD is merging RIN 0750-AK83 with this RIN because both RINs address modular open systems approaches and proprietary data restrictions. DoD is proposing to amend the Defense Federal Acquisition Regulation Supplement to implement section 804 of the National Defense Authorization Act (NDAA) for Fiscal Year (FY) 2021, paragraphs (a), (b), and (d) of section 809 of the NDAA for FY 2017 and paragraph (b) of section 815 of the NDAA for FY 2012. Section 804 addresses the use of modular system interfaces in acquisition strategies for major defense acquisition programs and replaces the term "major system interfaces" with "modular system interfaces" as it pertains to such programs. Paragraphs (a), (b), and (d) of section 809 address the restriction, by contractors and subcontractors, of DoD’s rights relating to items or processes developed exclusively at private expense, and the negotiation of rights relating to items or processes developed with a mix of Government and private funding. Paragraph (b) of section 815 provides that DoD may not challenge a contractor’s proprietary data restrictions more than 6 years after the date of final payment on the contract or delivery of the technical data.