I would think we're entering troublesome waters if someone is copying a commercially available study chart and sending PDFs around to people.

Folks: Please go to the Spark Charts website and order them. You can download them direct, and they're reasonably priced.

Posters: Please go for a one-for-one relationship on these charts-- if someone wants to buy the original, please sell it to them and pack it up and ship it. It's not fair to make money on (or really, even hand around freely without permission) copied versions of these charts. Copyright and fair use laws exist for a reason, and when people ignore them, it's harder to tell outfits like the RIAA to go pound sand.