I am reading an ebook that requires me to write in the book, annotate it, and draw diagrams on the pages. I also want to be able to save paper by not printing out the ebook from Adobe Digital Editions in order to annotate. For some reason, the annotation features are grayed out for my book. Adobe Reader on the tablet and computer allows me to annotate, and draw diagrams on my pdf files, so why can't I do this on Digital Editions? Any help would be greatly appreciated!