Gene Maddaus Senior Media Writer Filmmakers are warning that a recent ruling in a copyright suit against Netflix over its “Tiger King” docuseries could restrict the use of video clips in documentaries, and upset a long-held understanding of what constitutes “fair use.” The 10th Circuit Court of Appeals, based in Denver, ruled in March that the use of a 66-second excerpt from a funeral video was not “transformative” under the Copyright Act. The three-judge panel remanded the case to a lower court to determine if Netflix violated the copyright of Tim Sepi, the videographer who shot the scene.