International Datacasting Corp. said Friday that Del Lippert has resigned as chairman due to health reasons. The Ottawa-based maker of digital-content distribution technology said Chris Van Staveren has been appointed the new chairman, effective Feb. 1. Lippert had been a member of the board since June 2012, International Datacasting said in its release, and served as interim CEO between November 2012 and May 2013 before being replaced by Doug Lowther. The company also said Georges Ata has resigned from the board to focus on his role as CEO of Intelcan Technosystems Inc., an Ottawa-based maker of air-navigation systems....