Many copyright owners co-own their copyrights with others, or at least they thought so until the decision came down in Sybersound Records, Inc. v. UAV Corp., 517 F.3d 1137 (9th Cir. 2008). If your co-owned copyright interest came through an assignment from someone who was themselves a co-owner, rather than arising as a result of joint authorship, then you may be surprised to learn, as were the Sybersound plaintiffs, that you might not co-own the copyright interest that you thought you did.

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