Progressive downloading

The progressive downloading (British: progressive download) is a technique to reproduce while downloading data as well as streaming.

By the progressive downloading, I take a form to reproduce while downloading a file using HTTP as a protocol mainly. Because the downloading from the middle is technically difficult, I tend to leave cash, and is high-speed, seeking it by the client-side is possible. An animation cannot reproduce smoothly until cash collects if one side, transmission rate are slow. The load of the server side does not turn for greatly large-scale delivery to be seen in the streaming for it smoothly by adjusting a communication band in a server side, and to perform seeking it in a server-side. Therefore the streaming is suitable for live delivery, and the progressive downloading is suitable for on-demand delivery.

I continue saving it as a file at one time without (the client who can save it exists) which is often made to cancel the data after reproduction in the case of the streaming by the protocol for the streaming canceling it in the case of progressive downloading by the HTTP, and cash is used at the time of the next reproduction as far as cash remains. However, seeing from the exceptional point of view of "the reproduction for private use" of the copyright, there are a problem and a viewpoint to do because there is it in the situation that I can access as a file at one time when a progressive downloads a book. However, "reproduction (eight of Article 47) with the use of the book in the computer" is established, and the temporary preservation to a disk for efficiency is legalized when there is not an infringement with a copyright the use of the book. In addition, the private use without the reproduction cannot violate a copyright because there is not what's called right to use in a copyright. When private use is limited by the contract by the agreement, it becomes the inobservance of a contract not a copyright infringement when I break an agreement. In addition, the downloading preservation by the user does not become with the replication of the fixture when a service administration side becomes the reproduction main constituent (the and automatic public transmission main constituent) of the book. But (including capture and the photography) fulfills recording, recording when I immobilize sound and appearance itself in hard disks and save it.

A site using progressive downloading includes YouTube or other video sharing sites. In addition, merits include that it is not necessary to set up a streaming server because transfer by the HTTP is possible. Things adopting an HTTP progressive downloading technology increase (including Microsoft Smooth Streaming^[1] used in Silverlight), and, in the recent streaming technology, I am used for Gyao! or Yahoo by affinities with a detour and the CDN of the fire wall [²].

References

1. ^ About MSDN IIS Smooth Streaming
2. ^ Reason of the Silverlight adoption to hear in 9 special interview - Yahoo

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