ThankyouKenner- Are you referring to bootlegs as repros? There is a world of difference between the two if so!
Bootleg are vintage era copies of licensed figures that were usually produced by companies in countries where kids had no access to the originals (or couldn't afford them). Due to their weird and wonderful colour schemes, paint jobs or sculpts they are rarely confused for original figures.
Repros on the other hand are modern day imitations that often fool new collectors. This kind of stuff: http://www.ebay.co.uk/itm/VINTAGE-STYLE-STAR-WARS-CUSTOM-STAR-WARS-POTF-YODA-RECARD-92-BACK-/121801166784?hash=item1c5bea4fc0:g:5a0AAOSw9mFWMoTT