I am writing an iOS app that will deliver proprietary audio and video content. App users will be able to sign in using Apple ID. I was wondering if I should also allow Facebook Single Sign-On (SSO) into the app? From what I have read so far, the only reliable way of ensuring the content is protected is to use Apple FairPlay DRM. Will using Facebook SSO (or any other SSO for that matter), weaken the DRM system in the app?