The extreme cases (where there is no/incorrect mapping between the glyph and the character they represent) are a real pain! This mapping is stored as a ToUnicod

The extreme cases (where there is no/incorrect mapping between the glyph and the character they represent) are a real pain! This mapping is stored as a ToUnicode map inside the PDF. In the past I've used OCR to handle such cases but I'm planning to create an experimental interface where anyone can modify the ToUnicode map. The challenge would be to make the modifications automated/user friendly.