What she most likely means is that, as Zen notes, there were two works of such striking similarity as to reject happenstance, but there wasn't clear evidence who the cheator and who the cheatee were. The hope is that someone else saw the event and rats them out, which happens pretty frequently.
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"Whenever the word 'fair' features so prominently in legislation, the odds are that it is economically illiterate"
-Rich Lowery
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