You can certainly preview what ever amount of film you have downloaded.
Also you can right click on any file in the search window,> advanced > look up file with Bitzi This will open your browser and take you to a page giving known information on the file. Many people will not download a large file without seeing a positive Bitzi report.

I'm afraid this happens on p2p and it is annoying and who knows exactly why it happens.. a mistake, a wind up or attempted sabotage of the network, made worse by the fact that someone will re share a file before watching it and so the whole thing snowballs.

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