To that picture, you have to add the entire context of cyber security, or Network and Information Security in the Digital Agenda for Europe.

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For this reason, the administration is pursuing a comprehensive cyber security approach to securing our digital infrastructure.

WHITEHOUSE: "Doing What Works" Transcript

Bruce Schneier, a cyber-security expert and author, worries that readers may steer clear of digital books on sensitive subjects such as health, sexuality and security including his own works out of fear that their reading is being tracked.

WSJ: Your E-Book Is Reading You