Abstract: A method wherein digital content, distributed on DVD (standard and High Definition variants such as Blue-Ray), CD (Computer Disk), or other digital storage media or downloaded as one or more files or streamed or broadcast is played interspersed with one or more advertising slots (also referred to in this disclosure as just-in-time content slots). Also detailed is method and steps for discovery of advertising slot information and fetching content for each slot by DVD players or end-user equipment that enable just-in-time content slots per this disclosure. Also included is method and steps for managing DVD advertising slot inventory, targeting of advertisements, building and operating advertising network including market place for buying/selling/auctioning advertising spot inventory, making available advertisements for pickup by advertising slot publishers, and tracking of advertising performance as well as tracking of advertising slot performance.