In some embodiments, the invention includes a method of providing content including selecting a set of segments of content from a group of segments to be protected. The segments of the set are protected with protection that can be undone. The group of segments are transmitted. In other embodiments, the...http://www.google.fr/patents/US20020188570?utm_source=gb-gplus-shareBrevet US20020188570 - PARTIAL PROTECTION OF CONTENT
