on Appropriations of the House of Representatives and by the Subcommittee on the Legislative Branch of the Committee on Appropriations of the Senate: Provided further , That of the total amount appropriated, $4,370,000 shall remain available until September 30, 2025 to complete the second of three phases of the shelving replacement in the Law Library’s collection storage areas: Provided further , That of the total amount appropriated, $5,500,000 shall remain available until September 30, 2022 for preservation activities, and may be obligated and expended only upon approval by the Subcommittee on the Legislative Branch of the Committee on Appropriations of the House of Representatives and by the Subcommittee on the Legislative Branch of the Committee on Appropriations of the Senate. Copyright Office Salaries and expenses For all necessary expenses of the Copyright Office, $91,409,000, of which not more than $38,004,000, to remain available until expended, shall be derived from collections credited to this appropriation during fiscal year 2021 under sections 708(d) and 1316 of title 17, United States Code: Provided , That the Copyright Office may not obligate or expend any funds derived from collections under such section in excess of the amount authorized for obligation or expenditure in appropriations Acts: Provided further , That not more than $6,778,000 shall be derived from collections during fiscal year 2021 under sections 111(d)(2), 119(b)(3), 803(e), and 1005 of such title: Provided further , That the total amount available for obligation shall be reduced by the amount by which collections are less than $44,782,000: Provided further , That of the funds provided under this heading, not less than $17,100,000 is for modernization initiatives, of which $10,000,000 shall remain available until September 30, 2022: Provided further , That not more than $100,000 of the amount appropriated is available for the maintenance of an International Copyright Institute in the Copyright Office of the Library of Congress for