De Chiara, AlessandroManna, EsterRubí Puig, AntoniSegura, Adrian2026-02-182026-02-182025-12-010167-6245https://hdl.handle.net/2445/227006We build a model where an online hosting platform develops a copyright filter to screen content that contributors wish to upload. The technology is imprecise, since non-infringing material may be incorrectly filtered out. Once the content is hosted on the platform, a right-holder may send a take-down notice if its own monitoring system, also imprecise, finds it to be copyright infringing. The efficient design of regulation and liability calls for (i) giving the right-holder incentives to evaluate fair use when submitting a notice and (ii) lifting the safe-harbor protection granted to platforms that promptly remove content following a take-down notice.20 p.application/pdfengcc-by-nc-nd (c) De Chiara et al., 2025http://creativecommons.org/licenses/by-nc-nd/4.0/Drets d'autorServidors webCopyrightWeb serversinfo:eu-repo/semantics/article7660362026-02-18info:eu-repo/semantics/openAccess