A method for securing a content is disclosed. The method generally
includes the steps of (A) generating a media key by decrypting a media
key block based on a device key unique to a particular player of a
plurality of players, (B) modifying the media key by decryption based on
a class key such that the media key is unique for each of a plurality of
subscriber classes, (C) writing an encrypted title key in a media by
encrypting a title key based on both the media key after modification and
a media identification value unique to the media and (D) writing an
encrypted content in the media by encrypting the content based on the
title key.