Just a potential heads up if you bought the electronic version of David's LPX book from the iBooks Store, and are running a business.
I'm thinking to get LPX certified, so I bought the e-book for my business. I wanted to get a VAT invoice -- Apple does not normally issue them, but you should be able to get one by requesting it. I didn't do this when I bought LPX from the Mac App Store, but maybe I should have.
Well, in this case I was reminded by a helpful support person that I have agreed to make iTunes Store purchases only for personal, non-commercial use. That's not entirely true; after reviewing the iTunes Store Terms and Conditions, it seems that it is really like that for iBooks Store, but for Mac App Store and App Store purchases, the customer can be either an individual or a business.
The problem here is that, even though IANAL (I Am Not A Lawyer), I think legally I'm not allowed to use the e-book for commercial purposes. Also, I can't get a VAT invoice for an iBooks Store purchase for my business.
I guess I should have ordered the printed version of the book from Amazon in the first place. I'm going to try to get a refund from Apple, but I'm not surprised if they decline and cite the terms.
I know it's not a big deal money wise to not get the VAT refund, but the terms for iBooks were kind of surprising. After all, there are a lot of professional books available in the iBooks Store.
EDIT, a few days later: iTunes Store made an exception and will refund me for the e-book. I immediately ordered the printed book from Amazon UK.