yes, keys can be revoked [in offline players] by inserting a newer disc with a newer version of the "media key block." wikipedia suggests they're up to version

yes, keys can be revoked [in offline players] by inserting a newer disc with a newer version of the "media key block." wikipedia suggests they're up to version 78 of that data. https://en.wikipedia.org/wiki/Media_Key_Block https://en.wikipedia.org/wiki/Media_Key_Block