Submitted by: Arshiya Zahid
Roll # 19
Submitted to: Ma'am Kiran Shahzad
The act of presenting another’s work or ideas
as your own.
Using another’s exact words without proper
The word “plagiarism” comes from
the Latin plagiarus meaning
The first copyright law was passed in 1709 protecting
the rights of publisher against book piracy.
Plagiarism is very ancient art.
HISTORY OF PLAGIARISM
3 great men who built their careers on plagiarism
1: Stephen Ambrose:
invented pop history.
2: T.s .Eliot:
3: Dr.Martin Luther king Jr:
advance the human race.
Copying a friend’s work
Cutting and pasting blocks of
text from electronic sources
Web publishing without
permissions of creators
Failure to use your own “voice”
THE TWO CATEGORIES OF
The earlier plagiarism detectors used to
“Plagiarism detection is the process of locating instances of plagiarism within a
work or document.”
1. Manual :
• Requires great effort or excellent memory
2: Software assisted :
• Allows vast collection to be compared to each other
• Making successful detection.
Global similarity assessment approaches:
Use the characteristics taken from larger parts of documents to compute
Local similarity assessment approaches:
Only examine pre-selected texts segment as input
Currently the most widely applied approach to
This method forms a set of multiple substrings
Minutiae matching with those suspicious
documents to suggest plagiarism
Used in internet
Used in computer science
Suspicious documents are compared for verbatim text
(reference collection from all documents)
External plagiarism detection
Bag of words analysis vector to the domain of
Documents are represented as one or multiple
vectors, e.g. for different document parts.
which are used for pair wise similarity computations.
Relies on citation analysis.
Only approach that does not rely on textual similarity.
examines the citation and reference information in texts
to identify similar patterns
this approach is suitable for scientific texts, or other
Citation analysis to detect plagiarism is a relatively
Intrinsic plagiarism detection
Stylometry analyze an author’s unique writing style
By comparing stylometric models for different text segments, passages that
are stylistically different from others, hence potentially plagiarized, can be
indicate that their performance depends on the type of plagiarism present
Except for citation pattern analysis, all detection approaches rely on textual
1. Understand what is plagiarism
2. Be familiar in the area that you are talking about
3. Restate the subject to yourself a couple of times
4. Reference your quotes and sources
5. When in doubt give credit