“…This is not to say that the functional equivalents of possession that we observe in the IP context-including both requirements that the IP owner has captured her intangible creation in a concrete way and has signaled her claim to others-are sufficient to serve possession's purposes. The failure of patents to provide adequate notice to rival inventors is a notorious shortcoming of the contemporary patent system (see, e.g., Bessen and Meurer, 2008;Fromer, 2009;Long, 2004;Menell and Meurer, 2013). As for copyrights, the requirement that claims to works of authorship be communicated to the public via a centralized registry or marked embodiments has been abandoned (see, e.g., Ginsburg, 2010;Litman, 2016;Sprigman, 2004).…”