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From Wikipedia, the free encyclopedia
Type of site
Plagiarism detection
Available inMultilingual
FoundedJuly 10, 2004 (2004-07-10)
Area servedWorldwide
IndustryDigital content

Copyscape is an online plagiarism detection service that checks whether similar text content appears elsewhere on the web.[1][2][3] It was launched in 2004 by Indigo Stream Technologies, Ltd.

Copyscape is used by content owners to detect cases of "content theft", in which content is copied without permission from one site to another.[4][5] It is also used by content publishers to detect cases of content fraud, in which old content is repackaged and sold as new original content.[6]


Copyscape was launched in 2004 by Indigo Stream Technologies, Ltd., co-founded in 2003 by Gideon Greenspan.[7] According to an interview with Greenspan, the company originally developed an alerting service called Google Alert, out of which the Copyscape service grew as an expansion.[8]


Given the URL or text of the original content, Copyscape returns a list of web pages that contain similar text to all or parts of this content.[9] It also shows the matching text highlighted on the found web page. Copyscape banners can be placed on a web page to warn potential plagiarists not to steal content. Copysentry monitors the web and sends notifications by email when new copies are found, and Copyscape Premium verifies the originality of content purchased by online content publishers.

Copyscape uses the Google Web API to power its searches.[10] Copyscape uses a set of algorithms to identify copied content that has been modified from its original form.

Reported use in plagiarism cases[edit]

Copyscape's use has been reported in cases involving online plagiarism:


  1. ^ Gilbertson, Scott (November 17, 2006). "Copyscape: Track Stolen Content". Wired. Retrieved July 25, 2019.
  2. ^ Keener, Matt (December 26, 2014). "16 Productivity Tools Nobody Can Live Without". Time. Retrieved July 25, 2019.
  3. ^ Mills, Elinor (February 8, 2007). "Steal this post". USA Today. Retrieved July 25, 2019.
  4. ^ Mapes, Diane (September 10, 2009). "Steal this story? Beware Net's plagiarism 'cops'". NBC News. Retrieved July 25, 2019.
  5. ^ Welch, Maura (May 8, 2006). "Online plagiarism strikes blog world". The Boston Globe. Retrieved July 25, 2019.
  6. ^ Klein, Karen E. (March 3, 2008). "Scanning for Scammers Before You Buy In". Bloomberg Businessweek. Retrieved July 25, 2019.
  7. ^ "Gideon Greenspan". Retrieved July 25, 2019.
  8. ^ Weinberg, Tamar (April 21, 2016). "Interview with Gideon Greenspan, Co-Founder and CTO Copyscape". Host Advice. Retrieved July 25, 2019.
  9. ^ Klein, Karen E. (March 3, 2008). "Scanning for Scammers Before You Buy In". Bloomberg Businessweek. Retrieved July 25, 2019.
  10. ^ Delaney, Kevin J. (December 18, 2006). "Copyright Tool Will Scan Web For Violations". The Wall Street Journal. Retrieved July 25, 2019.
  11. ^ "Brayton Purcell LLP v. Recordon & Recordon, 361 F.Supp.2d 1135". United States District Court for the Northern District of California. March 18, 2005. Retrieved July 25, 2019.
  12. ^ Bailey, Jonathan (August 6, 2009). "9th Circuit Finds for PI Firm Over Theft of Firm's Web Site Content". Plagiarism Today. Retrieved July 25, 2019.
  13. ^ Festa, Paul (April 11, 2005). "Apple accused of copyright wrongs". CNET. Retrieved July 25, 2019.
  14. ^ Bersvendsen, Arve (April 6, 2005). "Apple and copyright violations". Virtuelvis. Retrieved July 25, 2019.
  15. ^ "The Fundy Post: Sorry Seems to be The Hardest Word". Scoop News. November 3, 2005. Retrieved July 25, 2019.
  16. ^ Middleton, Julie (November 4, 2005). "Maxim back in gun over plagiarism". The New Zealand Herald. Retrieved July 25, 2019.
  17. ^ Stiennon, Richard (December 9, 2005). "Copyscape, a very interesting twist on IP protection". ZDNet. Retrieved July 25, 2019.

External links[edit]