For more information:
http://www.rarelicenseddvds.com/region-free-tester-p-114.html
If you aren't sure whether your DVD player has addiional blocks by color format (effectively blocking pal, much as a VCR would), this tester DVD is an inexpensive way to check. If this tester DVD plays on your player, you can rest assured that your player does not block by color format (the standard block for VCRs) and that you can play any region free DVD.
