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A counterfeit is an imitation, usually one that is made with the intent of fraudulently passing it off as genuine. Counterfeit products are often produced with the intent to take advantage of the established worth of the imitated product. The word counterfeit frequently describes both the forgeries of currency and documents, as well as the imitations of clothing, software, pharmaceuticals, watches, electronics and company logos and brands. In the case of goods, it results in patent infringement or trademark infringement.
The counterfeiting of money is usually attacked aggressively by governments. The counterfeiting of goods is countenanced by some governments.
Counterfeiting of money or government bondsEdit
Counterfeit money is currency that is produced without the legal sanction of the state or government; counterfeit government bonds are public debt instruments produced without legal sanction, with the intention of "cashing them in" for authentic currency or using them as collateral to secure legitimate loans or lines of credit.
Counterfeiting of documentsEdit
Forgery is the process of making or adapting documents with the intention to deceive. It is a form of fraud, and is often a key technique in the execution of identity theft. Uttering and publishing is a term in United States law for the forgery of non-official documents, such as a trucking company's time and weight logs.
Questioned document examination is a scientific process for investigating many aspects of various documents, and is often used to examine the provenance and verity of a suspected forgery. Security printing is a printing industry specialty, focused on creating documents which are difficult or impossible to forge.
Counterfeiting of consumer goodsEdit
The spread of counterfeit goods (commonly called "knockoffs") has become global in recent years and the range of goods subject to infringement has increased significantly. Apparel and accessories accounted for over 50 percent of the counterfeit goods seized by U.S Customs and Border Control. According to the study of Counterfeiting Intelligence Bureau (CIB) of the International Chamber of Commerce (ICC), counterfeit goods make up 5 to 7% of World Trade, however these figures cannot be substantiated due to the secretive nature of the industry..A report by the Organisation for Economic Co-operation and Development indicates that up to US$200 Billion of international trade could have been in counterfeit and illegally-copied goods in 2005 . In November 2009, the OECD updated these estimates, concluding that the share of counterfeit and pirated goods in world trade had increased from 1.85% in 2000 to 1.95% in 2007. That represents an increase to US$250 billion worldwide. 
- ↑ ICC Counterfeiting Intelligence Bureau (1997), Countering Counterfeiting: A Guide to Protecting and Enforcing Intellectual Property Rights, United Kingdom.
- ↑ The Economic Effect of Counterfeiting and Piracy, Executive Summary (PDF). OECD, Paris (2007). Retrieved on 2007.
- ↑ Magnitude of counterfeiting and piracy of tangible products – November 2009 update (PDF). OECD, Paris (2009). Retrieved on 2010.
- World Cup Fakes War Could Be Won On Penalties 
- Detecting the Truth: Fakes, Forgeries and Trickery, a virtual museum exhibition at Library and Archives Canada
- 4The Dynamics of Fashion Third Edition; Fairchild Books, Inc. New York; Elaine Stone, professor emerita; fashion Institute of technology, New York
- International Hologram Manufacturers Association 
- International Authentication Association 
- Bank of England guide to bank note security features.
- Counterfeit Goods Data and Statistics Havocscope Black Markets