CPC Class H04N

A content server generates media playlists for social events. The content server receives a seed value describing desired characteristics of media to present during a social event, and event parameters describing conditions for selecting media items to generate a media playlist for the social event. The content server selects media items based on the event parameters and the seed value, and uses the selected media items to generate the media playlist for the social event. The media items in the playlist are retrieved from a media database and provided to a media player for presentation at the social event.

Video trailers for a video quote may be created and provided to a user. The Internet may be searched to identify documents that likely include references to a video. A reference to the video within an identified document may be detected and determined to be a video quote. The video quote and related information may be extracted from the identified document. A location of the video quote within the video may be determined. A video trailer that includes the video quote may be created based on the location of the video quote. A request for a video trailer that includes a video quote or a partial video quote, specified by the user, may be received from the user. A video trailer that includes the video quote or the partial video quote may be identified and provided to the user.

A signal is protected against an attack by an enhancement process that checks the conformity of an actual state of the signal with respect to an expected state. A protective action is exercised on the signal if the actual state of the signal is not in conformity with the expected state, so as to neutralize or nullify said attack.