The text (i.e. the list of words in a particular order) is clearly not copyrighted. But it is possible to copyright the means by which it is presented.
What this means is that there's no restriction on you distributing the words themselves, and it doesn't matter whether you got those words from a modern or ancient copy (as long as they're the same). But you couldn't simply photocopy the new version and distribute a copy of that (it's quite common for reprints to be made using photographs of a previous printing rather than resetting the text - to do this you need to own the copyright in the previous layout). This is why it's possible to copyright a new 'engraving' of Beethoven, since music can be laid out in many different ways, and doing so in a way that's useful for a performing musician adds value to the basic notation.
So you'll be quite alright if you scan the new version, OCR it and produce a new layout of the basic text, but you couldn't distribute a PDF made up of scanned jpegs. The only possible issue I can see is that in the process of doing the OCR you're creating a temporary copy of the new work in your computer's memory, but as long as this is destroyed after it's used it should be fine.
Any sort of modern translation is a different issue, since the creative effort involved in producing the translation has its own copyright.
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