Carleton University's Academic Integrity Policy has a clear definition of plagiarism:
Plagiarism is presenting, whether intentional or not, the ideas, expression of ideas or work of others as one’s own.
Plagiarism includes reproducing or paraphrasing portions of someone else’s published or unpublished material, regardless of the source, and presenting these as one’s own without proper citation or reference to the original source. Examples of sources from which the ideas, expressions of ideas or works of others may be drawn from include but are not limited to: books, articles, papers, literary compositions and phrases, performance compositions, chemical compounds, art works, laboratory reports, research results, calculations and the results of calculations, diagrams, constructions, computer reports, computer code/software, and material on the internet.
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When do we cross the line?