Abstract: A method of distributing a content object (C) using a publication server in a content delivery system, which in addition to the publication server comprises a plurality of interconnected user nodes adapted to cache content object packages and to perform on-demand playback of content objects, includes: receiving a content object; defining a partition of the content object into at least two packages; defining an initial distribution plan (IDP) identifying a collection of user nodes which are to cache the content object and package to be cached by the nodes; and transmitting the initial distribution plan to each node in the collection, enabling the user node to cache the at least one package to be cached.