Patent ID: 8515259

Claim:
A method for providing a progressive download service for an A/V data providing server and a playback apparatus supporting a BD-J specification, the method comprising steps of: (a) preparing an A/V data; (b) dividing the A/V data into a plurality of clips including a first clip group and a second clip group using a clip division information, wherein the first clip group includes one or more first clips each having a first size and the second clip group includes one or more second clips each having a second size larger than the first size; and (c) transmitting the plurality of clips from the A/V data providing server to the playback apparatus, wherein the clip division information comprises at least one of the first size, the second size, a number of the one or more first clips, a media network bandwidth of the A/V data, a customer network bandwidth necessary for transmitting the A/V data to the playback apparatus and a number of buffered clips, wherein a first mathematical expression B a × S s CB + N × S s MB ≥ N × S s CB + S c CB is satisfied, where S s represents the first size, S c represent the second size, N represents the number of one or more first clips, MB represents the media network bandwidth, CB represents the customer network bandwidth and B a represents the number of buffered clips.