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ship (and hence no way of trusting). Unless content is rights managed and encrypted, content owners run the risk of losing control of their media asset, once it replicates to edge caches. Search engines can mistakenly index content to edge servers rather than origin servers. This leads to the problem of indexing out-of-date content or else of storing links that are likely to break, as the cache is flushed for other uses. From the point of view of end-users, cached content is suspect, since there is no way to ensure that the content is presented as the content producer intended it. Edge services can modify content transparently, adding anything they like to the Web page or media stream, as it flows through the edge proxy. Malicious access to cached contents can lead to end-users being served counterfeit content. Cache abuse and cache poisoning are of great concern to content providers and content consumers alike. There is also the issue of transcoding quality. If the streamed content is compressed in a format that your player does not recognize, an edge proxy can decompress the content and recompress it into a format your player can play. However, transcoding can be performed with varying levels of quality. If the cache owner chooses to do a poor job of transcoding one content provider s material, but an excellent job with another that he has a business agreement with, the end-user will be served degraded content or excellent content, depending on the whims of the cache owner. A CDN that delivers Web search engine results could, for example, filter out hits that reveal the CDN s trade secrets or modify financial reports served via their CDN to obscure information damaging to the company. With MPEG-4 streams, it would theoretically be possible to remove an inconvenient individual from a scene entirely, in Stalinesque fashion, simply by blocking the elementary stream representing that person as an AVO. Similarly, what a person said, on record, could be transparently modified to imply meanings never expressed by the speaker. Indeed, somebody else s face entirely could be texture-mapped onto a talking face. Edge cache abuse such as this is not only possible, but also likely, unless the industry faces and solves trust issues associated with such tampering.
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Quality of Service (QoS) on IP networks is another important subject. It relates to the ability to get packets through the Internet reliably, with time-sensitive packets (such as those comprising media streams) able to jump queues and preallocate or reserve network resources, to avoid
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congestion. It also refers to the ability to guarantee time-sensitive packet delivery, with no packet loss. This is a critical network performance parameter for streaming media, since any delay in packet delivery or any packet loss manifests itself as stuttering playback and rebuffering delays. Both are unacceptable to the end-user (and content producer, for that matter). In other words, the quality of playback experience is highly dependent on the network s quality of service. Today, the Internet is undifferentiated. All packets get treated more or less the same way (except that UDP packets cannot be resent if lost). The Internet s routers make a best effort at sending each packet. There is no guarantee that each packet will follow the same path or that packets will arrive in the order they were sent. So, for the public Internet, there aren t any QoS guarantees offered, save the Service Level Agreements (promises not to let the purchaser of content delivery services down, without paying some money) offered by some specialist CDNs. Sending data into the public Internet does not guarantee its timely delivery, or even its delivery at all. We have already touched on the differences between UDP transmission and TCP transmission. The summary is that UDP is prone to data loss, but is also fast and simple, because packet transmission is not error checked. Firewalls tend to prohibit UDP traffic by default, unless the network administrator allows UDP to pass. So, people behind corporate firewalls can t receive UDP transmission. TCP, on the other hand, provides reliable packet delivery, since lost packets may be resent. TCP is the carrier for all HTTP Web page traffic, so all firewalls admit it. TCP is a best-effort protocol, but it achieves this through a slow-start algorithm that progressively increases the rate of packet sending, until packet loss is experienced. This is bad for streaming, because initial buffering does not make best use of the available bandwidth and the connection is eventually driven into loss, requiring data to be resent. We have also mentioned RTP, which differs from TCP in that it does not offer any form of reliability or a protocol for flow and congestion control. RTP cannot ensure real-time delivery, since it has no influence over the lower layers of the network that control resources in network switches and routers, but it is called a real-time protocol because packets contain a timestamp and it provides control mechanisms for synchronizing different streams with timing properties. The timestamp is used to place the incoming audio and video packets in the correct timing order. The synchronization properties are to ensure that several receivers can get the data at the same time, which is particularly important in video conferencing. Whereas TCP uses the lower-level IP for transport, RTP can
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