Suppose I'm developing a software and I operate in the country that doesn't recognize Software Patents. I make my software available for users in several countries including the United States. What if my software infringes some software patent? Am I liable for it? Are my users in the US liable for using software?

More specifically I'm interested in the following groups of my users:

  • US citizens on the territory of the US
  • Non-US citizens on the territory of the US
  • US citizens outside of the US and in the country where Software Patents are not enforced
  • US citizens outside of the US and in the country where Software Patents are not enforced but assuming that this country has an extradition agreement with the US

2 Answers 2


The fundamental description of infringement is given in USC 35 section 271(a) as:

"Except as otherwise provided in this title, whoever without authority makes, uses, offers to sell, or sells any patented invention, within the United States, or imports into the United States any patented invention during the term of the patent therefor, infringes the patent."

Note that infringement is defined as occurring within the United States. For that reason, your latter two circumstances fall outside the scope of infringement for purposes of United States law.

Under the circumstance you posit, and recognizing that the criteria for infringement as stated:

US citizens within the territory of the US may well be liable as patent infringers because they use the infringing software.

Non-US citizens are just as liable as patent infringers as users because US Courts have jurisdiction over anyone present in the US.

I think this answers the question as posed, but see USC 35 section 271 "Infringement of patent" for more details and nuance.

The text of USC 35 section 271 is available online from the Legal Information Institute at "35 USC § 271 - Infringement of patent" , from the USPTO in Manual of Patent Examining Procedure Eight Edition, Revision 9 (August 2012) [MPEP] at "35 U.S.C. 271 Infringement of Patent" and from the Office of the Law Revision Counsel in United States Code at "35 USC 271: Infringement of patent". (Note that MPEP is a specific version and in the future will not be the latest. The USC from the Office of the Law Revision Counsel is a beta website, with "beta" in the URL. I expect that link to go stale in the future.)

Finally, what you did not ask is whether you are liable as an infringer. If it is determined that you "sell" your software "within the United States," you are. Further, the International Trade Commission has jurisdiction to prevent importation of infringing devices (including software devices). So, while the ITC may not be able to haul you into a courthouse in Washington, D.C., it can issue an injunction that prohibits the importation of your software. Were that to happen, anyone who defied the injunction by, say, directly downloading your software into the US from a foreign website, would be in much deeper doo-doo than a mere infringer.

  • Since when has an offence not being in US stopped their authorities getting involved? Commented Sep 21, 2012 at 6:37
  • Whenever the offence was not committed on US soil
    – J-S
    Commented Sep 9, 2015 at 3:04

I don't think that anyone would need to worry about being extradited to the United States as a result of a patent infringement. Patent infringement is a civil matter not a criminal matter, and extradition is not available for civil matters.

Reference: Extradition – A Guide for Expats

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