Quote:
Originally Posted by rkomar
I'm curious whether any e-reader supports in-PDF annotations. I've done a bit of developing with Adobe's PDF SDK in the past, and found that they were very protective of the features that separate their cash-cow, Acrobat, from the free viewer programs. Annotations fell squarely into the for-cash features of PDF. I suspect that any program that supports annotations would not be cheap, and you could expect the cost to be added to the price of the e-reader if available.
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The PDF spec is open and anyone can create programs that do anything with PDF files, without paying anything to Adobe.
In your situation, you were using an SDK from Adobe, which is very very different from writing an app from zero with the purpose of viewing or editing PDF files. This is why Adobe were able to charge anything they wanted for any action you did with the help of their SDK. Writing code from scratch to handle PDFs is a much more difficult and laborious task compared with using an SDK to accomplish the same thing.
As an example of a very affordable app that is capable to handle PDF files with annotations I can direct you to the excellent GoodReader for iPad. It can handle all kinds of PDF annotations and it costs 3$.