From a statement over at the “FSF(Free Software Foundation)”:

According to the Journal, Mr Heise announced that SCO would challenge the GPL’s “legality” on the ground that the GPL permits licensees to make unlimited copies of programs it covers, while copyright law only allows a single copy to be made. The GPL, the Journal quoted Mr Heise as saying, “is preempted by federal copyright law.”

This argument is frivolous, by which I mean that it would be a violation of professional obligation for Mr Heise or any other lawyer to submit it to a court. If it were true, no copyright license could permit the licensee to make multiple copies of the licensed program. That would make not just the GPL “illegal.” Mr Heise’s supposed theory would also invalidate the BSD, Apache, AFL, OSL, MIT/X11, and all other free software licenses. It would invalidate the Microsoft Shared Source license. It would also eliminate Microsoft’s method for the distribution of the Windows operating system, which is pre-loaded by hard drive manufacturers onto disk drives they deliver by the hundreds of thousands to PC manufacturers. The licenses under which the disk drive and PC manufacturers make multiple copies of Microsoft’s OS would also, according to Mr Heise, violate the law. Redmond will be surprised.

Not being one to blow my own trumpet (well, actually I am) but I made a “similar point(magpiebrain – SCO’s attack on the GPL)”: a while back.