Abstract: Content delivery is provided responsive to content consumer requests by providing dynamically generated manifests to content consumers, the manifests providing retrieval information to retrieve content or media fragments of content from segments of a broadcast or Webcast and alternative or replacement content. Alternative or replacement content may be targeted, for example selected based in part on characteristics associated with the content consumer. Content fragments may be cached with CDNs, for example based on a defined preference. Actual insertion of alternative content may occur upstream of a content consumer device or at the content consumer device.

Abstract: Content providers or media outlets may provide opportunities to place insertion or replacement material, for example, advertisements, into alternate streams or feeds of programming. A clearinghouse of such for various content providers may be automatically maintained and updated. Entities with insertion or replacement material may reserve, bid on or automatically place insertion or replacement material. An insertion system component may automatically insert material in an alternative feed of programming, for example, automatically replacing locally relevant advertisement in a broadcast with more general or even more specific advertisements in a Web feed of the programming. Organization of the insertions or replacement may be automatically determined based on various criteria.

Abstract: A method, and an associated system, for sending to a first group of recipients only the content portions of a continuity source data-flow which takes the form of ordered, successive, alternating content and non-content segments. From a methodologic point of view, the invention involves, in a manner which utilizes content-segment material buffering, delivering fully, and in correct order, to the first recipient group the material in each content segment, via steps including (a) bridging each gap between next-adjacent content segments at least partially with transmitted injection material that differs from the non-content segment material in the gap, which injection material ends in time no sooner than the end of the gap, and (b) employing, as needed, and as a part of such full delivering of content-segment material, time-progressive, time-length-variable buffering, and subsequent, progressive buffer-delivering, of any content-segment material which overlaps in time with the transmission of injection material.