French media sites will be removed from Google's index if the country's government goes ahead with a law that will require search engines to pay for content through a special tax.
The proposed law is the result of lobbying by French publishers, who object to Google earning advertising revenue by linking to their content.
They want Google and other search engines to be legally mandated to compensate them, an idea that has has found favour with the French minister of culture, Aurélie Filipetti, La Voix du Nord reports.
"It seems important to develop this kind of tool, a right to related material, for news publishers," Filipetti said, expressing her support for what she called a Lex Google.
In response, Google France wrote to Filipetti, saying it would cease to index French media sites if the law is passed. In the letter, Google France said it sent some four billion readers to French media pages every month.
Filipetti was dismayed by Google's letter, saying she was surprised by the tone of the correspondence, "which is akin to a threat".
"You do not deal with a democratically elected government through threats," Filipetti warned.
A similar law was presented to the German Bundestag in August this year, requiring payment for excerpts used by search engines, which was also met with anger by Google. Its head of communications, Kay Oberback, said at the time that "nobody sees a real reason why this should be implemented."
According to Oberback, those who don't want their content indexed can simply put up a robots.txt file on their sites to be excluded.
He also notes that Google sends readers to publishers' sites and that publishers make money off AdSense.
Such notions were brushed off by French publishers.
The director-general of current affairs publications Les Echos, Francois Morel, said last month that it was unacceptable that Google used newspaper articles for free.