A number of forum members have been hit by an extortion letter sent by an alleged patent troll (see this thread: http://printplanet.com/forums/prepress-workflow-discussion/31080-license-infringement-letter). The issue was discussed at the "Protecting Small Businesses and Promoting Innovation by Limiting Patent Troll Abuse" hearing in Washington DC December 17, 2013.
You can listen to three short audio files containing the testimony of;
Michael Makin 
President & CEO
Printing Industries of America

and
Dana Rao
Vice President and Associate General Counsel for Intellectual Property Litigation
Adobe Systems, Inc.