WordNet (r) 3.0 (2006):

public knowledge
    n 1: knowledge that is available to anyone [syn: public
         knowledge, general knowledge]

Moby Thesaurus II by Grady Ward, 1.0:

32 Moby Thesaurus words for "public knowledge":
   PR, ballyhoo, blurb, bright light, celebrity, common knowledge,
   cry, currency, daylight, eclat, exposure, fame, famousness, glare,
   hoopla, hue and cry, limelight, maximum dissemination, notoriety,
   plug, press notice, public eye, public relations, public report,
   publicity, publicity story, publicness, puff, reclame, report,
   spotlight, write-up