http://news.cnet.com/8301-13579_3-57486048-37/apple-to-samsung-dont-reveal-ipad-iphone-sales-data/
I wonder what is (or is not) in these documents that Apple is so concerned about. I mean - in comparison to what is stated at the Quarterly and Annual reports. The buyer survey is definitely interesting.
Sales by SKU is probably what they don't want revealed. They have never reported such a break down before, only sales by family (iPhone - iPad - Mac).