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I apologise if the topic has already been disussed before, but on another subforum here
the following issue was raised: if using RSS feed could cause duplicate content impression to SE. We haven't found the exact conclusion there, so I think it could be relevant to talk about it here. Logically, the issue sounds quite reasonable, as due to the RSS feed, the same content may be included in a row of different sites' pages. On the other hand, RSS feed is somewhat different from any other content, and doing my own research I came to conclusion that SE should not perceive it as duplicate one. However I can't correctly formulate why it is so from the technical point of view.
Do you have any ideas?
doing my own research I came to conclusion that SE should not perceive it as duplicate one
What research? Did you set up tests? How did you reach your conclusion.
Google actually has "File Format: Unrecognized" against rss results. What makes you think it is treating rss as a "somewhat different" from other content.
With Google, I suspect that they just translate the xml into text. In this case there is a danger of it being regarded as duplicate content. Not too serious if they just bury your rss page in the SERPS but read this thread [webmasterworld.com] for the possibility that it can really harm you.