Quote:
Originally Posted by Tex2002ans
Feel free to take Shakespeare's or Plato's works and use them wherever. 
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Shakespeare, yes.
Plato is far less clear-cut. Any printed edition of Plato, unless it's a facsimile of an original Greek manuscript, is almost certain to be emended and annotated (assuming it's published in the original Attic Greek), and such changes are protected by copyright. If it's translated into another language such as English, the translation does of course carry its own copyright even if the material being translated is in the public domain.