If C-SPAN were Disney, I might understand (though I would not sympathize with) a desire to milk an asset for every penny allowable by law. But, C-SPAN is not Disney and you should not treat the U.S. Congress like Disney would treat Mickey Mouse.Link
C-SPAN is a publicly-supported charity. Your only shareholders are the American public. Your donors received considerable tax relief in making donations to you. You and your staff were well paid for your excellent work. Congressional hearings are of strikingly important public value, and aggressive moves to prevent any fair use of the material is double-dipping on your part. For C-SPAN and for the American public record, the right thing to do is to release all of that material back into the public domain where it belongs.