Self-Plagiarism is defined as a type of plagiarism in which the writer republishes a work in its entirety or reuses portions of a previously written text while authoring a new work. Writers often maintain that because they are the authors, they can use the work again as they wish; they can’t really plagiarize themselves because they are not taking any words or ideas from someone else. But while the discussion continues on whether self-plagiarism is possible, the ethical issue of self-plagiarism is significant, especially because self-plagiarism can infringe upon a publisher’s copyright. Traditional definitions of plagiarism do not account for self-plagiarism, so writers may be unaware of the ethics and laws involved in reusing or repurposing texts.
Authors can quote from portions of other works with proper citations, but large portions of text, even quoted and cited can infringe on copyright and would not fall under copyright exceptions or “fair use” guidelines. The amount of text one can borrow under “fair use” is not specified, but the Chicago Manual of Style (2010) gives as a “rule of thumb, one should never quote more than a few contiguous paragraphs or stanzas at a time or let the quotations, even scattered, begin to overshadow the quoter’s own material” (pg. 146).
Ithenticate. The Ethics of Self-Plagiarism. (White Paper)http://www.ithenticate.com/resources/papers/ethics-of-self-plagiarism. Viewed 06/08/2015.
Whereas plagiarism involves the presentation of others’ ideas, text, data, images, etc., as the products of our own creation, self-plagiarism, occurs when we decide to reuse in whole or in part our own previously disseminated ideas, text, data, etc without any indication of their prior dissemination. Perhaps the most commonly-known form of self-plagiarism is duplicate publication, but other forms exist and include redundant publication, augmented publication, also known as meat extender, and segmented publication, also known as salami, piecemeal, or fragmented publication. The key feature in all forms of self-plagiarism is the presence of significant overlap between publications and, most importantly, the absence of a clear indication as to the relationship between the various duplicates or related papers.
Miguel Roig. Plagiarism and self-plagiarism: What every author should know. Biochemia Medica 2010;20(3):295-300.http://dx.doi.org/10.11613/BM.2010.037