Amazon.com has drawn criticism from multiple sources, where the ethics of certain business practices and policies have been drawn into question. Amazon has faced numerous allegations of anti-competitive or monopolistic behavior, as well as criticisms of their treatment of workers and consumers. Concerns have frequently been raised regarding the availability or unavailability of products and services on Amazon platforms, as Amazon is considered a monopoly due to its size. Anti-competitive practices One-click patent The company has been controversial for its alleged use of patents as a competitive hindrance. The "1-Click patent" is perhaps the best-known example of this. Amazon's use of the 1-click patent against competitor Barnes & Noble's website led the Free Software Foundation to announce a boycott of Amazon in December 1999. The boycott was discontinued in September 2002. On February 22, 2000, the company was granted a patent covering an Internet-based customer referral system, or what is commonly called an "affiliate program". Industry leaders Tim O'Reilly and Charlie Jackson spoke out against the patent, and O'Reilly published an open letter to Jeff Bezos, the CEO of Amazon, protesting the 1-click patent and the affiliate program patent, and petitioning him to "avoid any attempts to limit the further development of Internet commerce". O'Reilly collected 10,000 signatures with this petition. Bezos responded with his own open letter. The protest ended with O'Reilly and Bezos visiting Washington, D.C., to lobby for patent reform. On February 25, 2003, the company was granted a patent titled "Method and system for conducting a discussion relating to an item on Internet discussion boards". On May 12, 2006, the USPTO ordered a re-examination of the "1-Click" patent, based on a request filed by actor Peter Calveley, who cited the prior art of an earlier e-commerce patent and the Digicash electronic cash system. Canadian site Amazon has a Canadian site in both English and French, but until a ruling in March 2010, was prevented from operating any headquarters, servers, fulfillment centers or call centers in Canada by that country's legal restrictions on foreign-owned booksellers. Instead, Amazon's Canadian site originates in the United States, and Amazon has an agreement with Canada Post to handle distribution within Canada and for the use of the Crown corporation's Mississauga, Ontario shipping facility. The launch of Amazon.ca generated controversy in Canada. In 2002, the Canadian Booksellers Association and Indigo Books and Music sought a court ruling that Amazon's partnership with Canada