The theory of "self-plagiarism" is self-contradictory or a misnomer, since plagiarism relates to the use of others' material. It is a concept promoted to enforce publishing house revenue rights which may be challenged by the actual author of the material they make profits upon. Self-plagiarism includes duplicate publication of an article or partitioning of one study into multiple publications i.e. salami-slicing or text recycling; and finally copyright infringement.
We must insist that submitting authors do not infringe copyright by duplicating material that is published in journals that may hold the copyright. Duplicate publication, multiple publications, or redundant publication refers to the author's act of publishing exactly the same intellectual material.
We advise submitting authors to ensure that the data set upon which their research relies has not been previously published and if so that it is referred to in the references. We appreciate and support occasions where a new facet of the analysis of previous databases may now originally contribute to scientific debate such examples have become manifests by technological innovations in statistical and neural network analysis of large databases.
Work apart from fair use may occasionally reworked and ethical self-plagiarism when either: it must be re-quoted to provide a groundwork for the new contribution of another work; where repetition is necessary to answer further evidence and comments; where the readership is demographically altered from the initial outlet that reissue is required to disseminate the work e.g. when OA Publishing London offers to back catalogue print journals to make them available for open access. We expect all work to be cited within the manuscript, even self-work.
Sanctions for plagiarism, duplicate publication and citation manipulation may include:-