Cleaning PDFs
When I buy digital music from the likes of Prestoclassical, it often (though not always) comes with a digital PDF version of the booklet that would have accompanied the physical CD in its jewel case. An example of the front page of one such PDF is shown at the left, belonging to a digital download of the film music of William Alwyn I bought back in October.
The trouble with such digitised booklets, however, is that the PDF often contains data embedded within the file that is not necessarily something you want to keep. In this case, for example, if I open the purchased booklet PDF in my standard PDF viewer (on Kubuntu, that's Okular) and select File -> Properties, I see this: [...]