Novell is prepared to use its portfolio of US software patents to protect against patent lawsuits of the open-source software it ships.
Novell hopes to reassure purchasers of the company's open-source software, such as the SuSE Linux operating system and Ximian desktop software, are as safe from legal attacks as proprietary software.
It plans to use the "same measures generally used to defend proprietary software products", in the event that any of the open-source projects included in Novell's be accused of patent infringement.
Although software patent disputes are fairly common in the high technology industry, open-source software's vulnerability to a patent suit has received particular attention recently, spurred in part by The SCO Group's claims that the Linux kernel violates its intellectual property (IP).
Because open-source code tends to be created by diverse groups of developers who write code that can be easily scrutinised, some critics have said that it may be easier for companies to make IP claims against it.
An August study, funded by insurance provider Open Source Risk Management, found that 283 registered software patents, including 27 held by Microsoft, could conceivably be used as the basis of lawsuits against the Linux kernel.
Recently, the City of Munich halted a 14,000 PC Linux roll-out to investigate the patent liabilities associated with such a large deployment of open-source software. The city eventually decided to go ahead with Linux after concluding that the risk of software patent infringement was "very small", said Stefan Hauf, a spokesman for the city.
Novell's statement of a patent policy follows similar declarations from open-source providers such as IBM and Red Hat.
In August, IBM senior vice-president of technology and marketing Nick Donofrio said his company would not use its patents against the Linux kernel. Red Hat has aslo recently begun amassing a patent portfolio, to be used only for "defensive purposes".
Novell is in a unique position to defend open-source software, said Novell's Lowery, because with 411 patents in its portfolio, it has far more patents than other open-source providers, such as Red Hat.
Linux advocate Bruce Perens, who has long warned of the patent threat to open-source software, welcomed Novell's new patent policy, but said that a patent defence might have no effect against a company that had cross-licensed patents with the company.
"The only problem that can potentially come up is when one of Novell's own partners is the one who is bringing actions against open source," Perens said.
Lowry declined to comment on which, if any, companies had cross-licensing deals with Novell.
"We don't make our cross-licensing arrangements public," he said. "However, cross-licensing issues were certainly considered in the formulation of the patent policy statement we just put out."
Linux suppliers, including Novell, could do more to mitigate the patent threat, Perens said.
"I would like to see statements like this from other companies that would both explicitly promise not to use their patents against open source and promise to stand beside us in defending open source from patents. I would like such documents to be legally binding. The ones I've seen so far fall short of that."
Although Novell's patent policy does not say whether or not the company will ever use its patents against Linux, Novell has no intention of using its patents against open source, Lowry said.
"It's nice that they say they won't use their patents against open source," Perens said. "They should write it down explicitly in the next revision of this policy."
Robert McMillan writes for IDG News Service