Michael Buesch, lead developer of the Linux driver for Broadcom's wifi chipset (bcm43xx), stumbled across copied code in the OpenBSD's bcw driver earlier this week. The problem is that the bcm43xx linux driver uses a GPL license. OpenBSD inadvertently makes that linux code available to be used in a proprietary manner, by virtue of its BSD license (and not giving proper attribution where due).
"When people are least sure, they are often most dogmatic." -- John Kenneth Galbraith