“Plagiarism is copying another person’s text or ideas and passing the copied material as your own work. …You must both delineate (i.e., separate and identify) the copied text from your text and give credit to (i.e., cite the source) the source of the copied text to avoid accusations of plagiarism. Plagiarism is considered fraud and has potentially harsh consequences including loss of job, loss of reputation, and the assignation of reduced or failing grade in a course.
This definition of plagiarism applies for copied text and ideas:
(i) regardless of the source of the copied text or idea;
(ii) regardless of whether the author(s) of the text or idea which you have copied actually copied that text or idea from another source;
(iii) regardless of whether or not the authorship of the text or idea which you copy is known;
(iv) regardless of the nature of your text (journal paper/article, webpage, book chapter, paper submitted for college course, etc) into which you copy the text or idea;
(v) regardless of whether or not the author of the source of the copied material gives permission for the material to be copied; and
(vi) regardless of whether you are or are not the author of the source of the copied text or idea (self plagiarism).
This definition also applies for figures and figure legends and for tables and table legends which you copy into your text.”
Quoted from “Plagiarism: What It Is and How to Avoid It”, Peter Cobbett, PhD, August 2016