The first sign that something was amiss appeared in June, when a Russian hacker who goes by the user name Tessa88 started mentioning, in
underground web forums, a new trove of stolen Yahoo data, Mr. Holden said.
It is easy for ebook pirates to purchase a retail copy and use programs such as Calibre to strip the Adobe DRM and make it available on Torrent sites,
forums or even
underground subscription services that have fully functional Android apps to read the content or sophisticated
web based readers.