 On November 1, 2013, Ubisoft followed suit by discontinuing its Uplay Passport system for future titles, and making the pass for its recently released "" available at no charge.A Ubisoft spokesperson stated that the system was "no longer the best approach for ensuring that all our customers have the best possible experience with all facets of our games", noting that "Black Flag"s single-player campaign contained passive online features that would be otherwise unavailable without activating the pass.Sony specifically forbids the use of online passes by developers on PlayStation 4 titles; as users must have a PlayStation Plus subscription to use online multiplayer on most PS4 games, Sony did not want publishers to add additional DRM designed to charge users further.