Open source advocates Monday blasted a Linux licensing scheme that The SCO Group is proposing to address alleged copyright violations in the Linux operating system.

SCO CEO Darl McBride announced the licensing plan on a conference call with press and analysts earlier in the day. "SCO is prepared to offer a license for SCO's UnixWare 7.1.3 product for use in conjunction with any Linux product," he said. "This licensing format will assure that Linux users will be able to run Linux in full compliance with SCO's underlying [intellectual property] rights." SCO will begin discussing the new licensing scheme with customers this week, McBride said.

Linux advocates blasted the plan.

"They're selling a pig in a poke," said open source advocate Bruce Perens. "I think they've made an error through overconfidence, and that error has made them liable to be sued by every person who has code in the kernel, and every company," he said.

Perens and other open source advocates claim that SCO's licensing scheme appears to violate the Free Software Foundation's GNU General Public License (GPL) software license that governs Linux.

"It's very definitely in violation of the GPL," said Perens, who believes that SCO's terms would place restrictions on Linux users' ability to modify and redistribute source code, making it at odds with the GPL. "We do not authorize our code to be used under the terms of the SCO license; it's very plain in the GPL," he said.

An independent intellectual property lawyer observing the lawsuit said that Perens' contention had merit. "I think that's a good argument," said Jim LaBarre, a partner with Burns, Doane, Swecker & Mathis LLP, a law firm in Alexandria, Va. "On its face it sounds like that's a plausible argument," he said.

SCO disagreed, saying that its new license, which has yet to be publicly revealed, will not conflict with GPL.

The Linux source code has been under attack from SCO, of Lindon, Utah, for months now. In March, the company sued IBM for $1 billion, claiming that Big Blue had harmed SCO's market for Intel-based Unix operating systems by improperly adding code to the Linux kernel, the software program at the center of the Linux operating system.

At the time, SCO claimed its dispute was with IBM and not the Linux community, but it has gradually set its sights on Linux users as well. In May, SCO sent letters to 1,500 companies warning them that they could be held liable for IP violations in Linux, and on Monday SCO's attorney David Boies, of the firm Boies, Schiller & Flexner LLP, said that there was a possibility that SCO could pursue case-by-case litigation against companies that used Linux.

The IDG News Service is a Network World affiliate.