Diebold, an US manufacturer of voting machines, seems to violate the GPL. According to engadget.com, Diebold used a modified version of Ghostscript (a Postscript interpreter) without publishing the modifications of the source code. Artifex, of course, are not amused. See the archieves of the gs-devel Mailinglist for the related posting.
In case of machines that are built on top of trust (Diebold also build ATMs, BTW), Diebold machines seem to be the wrong choice. The whole issue will, unfortunately, discredit other companies as well.
