Because we embed fonts in our PDF documents, the encoding of characters doesn't match anything else, so copying and pasting from a PDF to another application doesn't work.

This is explained here: http://xmlgraphics.apache.org/fop/fonts.html#embedding

We need to either stop embedding the fonts (which means that the appropriate font might not exist on the client, or might be a similar named font with different metrics), or create our embedded fonts with the '-enc ansi' option, which limits the PDF to WinAnsi characters, roughly iso-8889-1