Nodes and methods for use in has content distribution systems

A content delivery system comprising:

• at least one server node, adapted for delivering a part of content in one or more versions, over a network on request in a requested version;
• at least one client node, adapted for receiving a part of content video data available via the network and issuing a request for a part of content in one of multiple versions;
• a network node, in between said at least one server node and said at least one client node, the network node is adapted for receiving a request for a part of content in a requested version issued by a client node of said at least one client nodes, determining if it will be capable to transmit said part of content in the requested version, if so, requesting and receiving said part of content from said server node in the requested version and transmitting said part of content to said client node in the requested version and otherwise informing said client node that it is not capable to transmit said part of content in the requested version.

A client node suited for use in a content delivery system for receiving a part of content available via a network adapted for delivering a part of content in one or more versions on request and issuing a request for a part of content in a requested version, further being adapted for receiving information of at least one network node, suited for use in between at least one client node and at least said server node, said information indicating that said network node determined that it will not be capable to transmit said part of video data requested in said requested version.

A method for operating a network node for use in a content delivery system and suited for use in between at least one server node, adapted for delivering a part of content in one or more versions over a network on request and at least one client node, adapted for receiving a part of content available via the network and issuing a request for a part of content in a request version, the method comprising receiving a request for part of content in a request version issued by a client node of said at least one client nodes;

• determining if it will be capable to transmit said part of content in said requested version upon receipt thereof, if so, requesting and receiving said part of content in said requested version from said server node and transmitting said part of content in said requested version to said client node and otherwise informing said client node that it is not capable to transmit said part of content in said requested version.