 Unlike DVD region codes, Blu-ray region codes are verified only by the player software, not by the optical drive's firmware.The latest types of Blu-ray players, suitable for UltraHD content, are not region-free, however the UHD discs they are designed for have not been coded to be locked to any region and will work worldwide.The Blu-ray Disc format employs several layers of digital rights management (DRM) which restrict the usage of the discs.