In an interview with Fortune magazine published this week, Microsoft's top lawyer, Brad Smith,, though he stopped short of detailing any. Specifically, he alleged that the Linux kernel violates 42 Microsoft patents; its user interface and other design elements infringe 65; OpenOffice.org infringes 45; and other packages infringe another 83 Microsoft patents.
Microsoft could have several motives for rattling its patent saber: slowing down open-source rivals, raising fears of open-source legal risks among customers, and winning payment for technology the company believes it deserves from a group that's generally been unwilling to pony up.
But according to Horacio Gutierrez, vice president of intellectual property and licensing at Microsoft, the company's move is designed to bring parties to the negotiating table that currently aren't there. "There is nothing specific about open-source software that warrants an exception of the intellectual property laws that apply to everyone else," Gutierrez said. He called the purported patent infringements "not accidental."
Microsoft is a major player in the existing legal and business establishment for handling intellectual property, which includes assets such as patents, trademarks and copyrights. That framework gives considerable power to incumbent companies with large patent portfolios and sufficient resources to pursue more.
"It's a game in which those who have a lot of resources to throw around have a lot of advantage," said Tom Carey, a partner in the Boston-based intellectual property law firm Bromberg & Sunstein.
As an example of what it would like to see,, in which Microsoft is selling coupons that permit use of along with the assurance that Microsoft won't assert its patents against customers. It's unclear how high open-source patent protection is on most companies' priority list, but Microsoft has made a big deal out of the fact that Linux protections are included in two patent-swap deals this year made with and .
Raising the prospect of open-source patent risks might not be likely to make Red Hat, the top Linux seller, overcome its current unwillingness to pay Microsoft for patent rights. But it could pressure Red Hat and others indirectly, either through jittery customers or through big-business partners such as IBM. That's Microsoft's hope.
"We don't think that customers will want to continue on without a solution to the problem," Gutierrez said. Microsoft also pointed to the fact that AIG, Credit Suisse, HSBC, Nationwide and Wal-Mart all have bought the Linux Suse Linux coupons from Microsoft.
But does open-source infringe?
The only problem with Microsoft's plan: so far its actions have only rallied the open-source troops, and not everyone believes the open-source gang egregiously violates the intellectual property regime.
"I don't think open-source is not playing by existing intellectual property rules," said Mark Radcliffe, an intellectual property attorney with DLA Piper. "Currently, open-source (participants) use copyright for everything they do. A lot of open-source companies have patents."
Radcliffe also derided Microsoft's reasoning that the purported open-source patent violations aren't accentual because the company thinks hundreds of cases exist. "It's an illusion or deceptive to say merely because there apparently are potentially a lot of patents infringed, it's intentional. That's certainly not the legal standard," he said. "I would also be willing to bet, given the number of patent suits against Microsoft that they've lost, under their own theory, Microsoft itself is intentionally infringing."
The fact remains, though, that patents and open-source software can be anathema. Patents give exclusive, proprietary rights to those who hold them, but open-source software is built on a philosophy of free technology sharing. Many in the open-source realm deride software patents and have been lobbying to curtail their influence.
When Novell and Microsoft announced their patent deal, the Free Software Foundation was quick to say it would move to prohibit such arrangements in a future version of the(GPL), the most widely used open-source license. The most recent draft seeks to prohibit all future deals of that nature and potentially past ones, too.
The timing of Microsoft's pronouncement is telling, Radcliffe said, "particularly when you think that GPL version 3 is still in draft. I don't think that is a coincidence," he said.
Red Hat, which indemnifies its customers against legal risks and has promised to rewrite any software found to violate others' intellectual property, told its customers Monday they have nothing to fear. "The reality is that the community development approach of free and open-source code represents a healthy development paradigm, which, when viewed from the perspective of pending lawsuits related to intellectual property, is at least as safe as proprietary software," the company said in a statement.
Microsoft won't say how much farther out of the scabbard it will pull its saber if the current effort fails to bring forth more patent deals with open-source companies.
"I don't have the answer for that. I have the answer for those that want to be responsible," Guttierez said.
But Microsoft would prefer not to sue, according to Guttierez. "If we wanted to litigate we would have done that a long time ago. Litigation is not an effective way of going about solutions," he said, adding that the company released the tally of potentially infringing patents now only after three years of effort to come up with a "constructive" way of dealing with the situation.
Open-source allies are willing to call Microsoft's bluff.
"I can't see it as any more than a somewhat hollow anti-open-source charade," said Matt Asay, vice president of business development for open-source document management start-up Alfresco. "If they want to really get people buying into their patents, they've got to put forth some substance...They haven't shown what the patents are or what they cover."
Larry Augustin, a venture capitalist who grew wealthy off a Linux-related initial public offering, told Microsoft on his blog to "put up or shut up." "If Microsoft believes that free and open-source software violates any of their patents, let them put those patents forward now, in the light of day, where we can all evaluate them on their merits," Augustin said. "If not, then stop trying to bully customers into paying royalties to use open source."
Litigation is unlikely, said Brian Kelly, an intellectual property attorney with Manatt, Phelps & Phillips: "If the end game is a lawsuit, you probably lead with a lawsuit."
Of course, SCO Group did lead with litigation in 2003 when it took on IBM with claims that Big Blue violated its contract by bringing proprietary Unix technology to open-source Linux. But Linux continues to spread widely despite that case--even with SCO suing actual customers.
At the same time, open-source allies are accumulating more legal heft by banding together and signing up some of the computing industry's largest companies. Oracle now sells its own version of Linux, and Sony, Red Hat, IBM, Novell and Philips formed thein 2005 to try to amass a patent counterweight. Patent holders who join the organization or license its patents agree not to sue over patents in the "Linux environment."
Even if Microsoft doesn't sign any more patent pacts, just slowing down the competition could be counted as a victory. Illuminata analyst Jonathan Eunice, in a blog posting Monday, likened Microsoft's patent threat to Iraq's use of Scud missiles in the Persian Gulf War.
"The point wasn't to actually use the weapon, but rather to require opposing forces to plan and take countermeasures against the possibility of use," he said. "While they were so occupied, they were less effective doing other things."CNET News.com staff writer Ina Fried contributed to this report.