Posner on plagiarism

Richard Posner has recently been writing about plagiarism:

"Recent “scandals” involving charges of plagiarism by professors and other writers treat plagiarism as (1) a well-defined concept that (2) is unequivocally deserving of condemnation. It is neither. Take the second point first. The idea that copying another person’s ideas or expression (the form of words in which the idea is encapsulated), without the person’s authorization and without explicit acknowledgment of the copying, is reprehensible is, in general, clearly false. Think of the remarkable series of “plagiarisms” that links Ovid’s Pyramus and Thisbe with Shakespeare’s Romeo and Juliet and Leonard Bernstein’s West Side Story. Think of James Joyce’s Ulysses and of contemporary parodies, which invariably copy extensively from the original—otherwise the reader or viewer would not recognize the parody as a parody. Most judicial opinions nowadays are written by law clerks but signed by judges, without acknowledgment of the clerks’ authorship. This is a general characteristic of government documents, CEO’s speeches, and books by celebrities.

When unauthorized copying is not disapproved, it isn’t called “plagiarism.” Which means that the word, rather than denoting a definite, well-recognized category of conduct, is a label attached to instances of unauthorized copying of which the society, or some influential group within it, disapproves."