InfiniteOS and GPLd Code?

Ximenes Zalteca writes "According to a recent MacInTouch article, "cache-computing" has derived or simply copied Linux/PPC code licensed under the GNU GPL and replaced the existing copyright with one of their own. The article can be found here. It's worth noting that this is far worse than the controversy over BeOS, because the InfiniteOS project has done more than simply not follow a tenant of the GPL it has replaced a copyright illegally. This is likely due to the common misconception that "free" software under the GPL is public domain. "