Adobe Digital Editions (DE) 4 does not use encryption for transmission of data to adelogs.adobe.com, which allows remote attackers to obtain sensitive information by sniffing the network, as demonstrated by book-navigation information.
https://exchange.xforce.ibmcloud.com/vulnerabilities/97696
http://twitter.com/AdobeSecurity/statuses/519826275008282624
http://the-digital-reader.com/2014/10/06/adobe-spying-users-collecting-data-ebook-libraries/