---- Crossing the duplicate content threshold with RSS feed parsing?
moftary - 12:43 am on Oct 22, 2008 (gmt 0)
you don't deserve to be banned, but you don't deserve to outrank the original source either.
Actually in some cases - not rarely, not mostly - the duplicated content might outrank the original content. There are so many metrics Google takes into account for ranking the very same content other than who was indexed first.
There is no ratio of original to duplicate content that will cause you to remain in the index.
I believe there is but that information is surely not publicly available.