Ebooks have many advantages, but as Techdirt has reported in the past, there are dangers too, particularly in a world of devices routinely connected to the Net. Back in 2010, we wrote about how Amazon was remotely uploading information about the user notes and highlights you took on your Kindle. More recently, we reported on how a school was using electronic versions of textbooks to spy on students as they read them. Against that background, you would have thought by now that companies would be sensitive to these kinds of issues. But if Nate Hoffelder is right, there‘s a big privacy problem with Adobe‘s Digital Editions 4, its free ebook reading app. Here‘s what Hoffelder writes on his blog, The Digital Reader: