Platform-level multi-DRMs such as Widevine and FairPlay are applicable only to video and audio content. NCG DRM can be applied to all types of multimedia contents such as video, audio, image, and document (PDF, ePub). You can also use NCG DRM to protect content on non-Google-certified Android devices that do not have Widevine built-in. However, the use of client SDK is mandatory for NCG DRM. And in some cases, NCG DRM porting may be required for player/reader applications.