a local or out-of-market broadcast station during the occupying station's normal sign-off period. The last major obstacle to the creation of a national superstation was knocked down on December 19, 1975, when the FCC unanimously voted to repeal a 1972 rule requiring cable systems selecting a distant signal from among television stations in the top-25 media markets to only select a station from one of the two closest markets to the licensed system. The FCC Cable Television Bureau contended the formation of superstations was unlikely due to the absence of evidence that television stations economically benefited from cable carriage. On October 1, 1976, the U.S. Congress unanimously passed the Copyright Act of 1976 in separate Senate floor and House voice votes. The law provides cable systems with a compulsory license – which, under Section 111, also applies to "passive" (passthrough) satellite carriers, allowing them to retransmit "copyrighted programming from any over-the-air [television and radio] stations across the country [or, with range restrictions based on their distance from the U.S. border, from Canada or Mexico]" without seeking the originating station's express permission – that requires payment of a flat semi-annual royalty fee based both on the number of distant signals retransmitted by the system and on their total subscriber receipts (0.675% of their gross receipts for the first distant signal, 0.425% for any other signal up to the fourth and 0.2% for each signal beyond the fourth, with a separate fixed-rate exemptions for systems that have a semi-annual revenue either below $80,000 or between $80,000 and $160,000), prohibits any modifications to the imported broadcast signal and its copyrighted content (such as commercials substituted by the cable system, permitting local broadcast stations to sue the systems if violating modifications are made), and established the Copyright Royalty Tribunal, a five-member commission of the U.S. Copyright Office that is tasked with reviewing cable and other royalty rates every five years (or sooner, if changes to program exclusivity or signal importation rules are made by the FCC) and compensates eligible owners of a copyrighted program who submit a written claim to receive the mandatory royalty paid by the cable system. Compulsory license rules for broadcast signal distribution were extended to the home satellite industry on October 21, 1988, through the passage of Satellite Home Viewer Act of 1988, which also restricted access to network programs exclusively to home dish users in "white areas" where broadcast