[bgsaru]

is it possible to know that whether the contents in one word document is copied from another word document ? how to know it ?

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no, not really. it doesn't keep track of words, phrases, and paragraphs. There are really only two options. A plagiarism checker (lots of them out there), like http://www.google.co...d-s/cadie.html. Or if there is a paragraph and the documents are stored locally, you might be able to search (windows search, google or bing desktop search) might aide.

If your coping from another source, make sure you attribute the source as you go.

[starjax]

no, not really. it doesn't keep track of words, phrases, and paragraphs. There are really only two options. A plagiarism checker (lots of them out there), like http://www.google.co...d-s/cadie.html. Or if there is a paragraph and the documents are stored locally, you might be able to search (windows search, google or bing desktop search) might aide.

If your coping from another source, make sure you attribute the source as you go.

[MiketheFarmer]

MS Word is not having plagiarism check feature. If you really wanna check the ethnicity of the content, you can go for many online plagiarism check software. Else, you can even try it on the Google Search Bar... 'That works for me ...