The problem with PDF and word and many such documents is part of a more prevailing phenomenon that is appearing in the computer world. As more and more data storage capacity appears and the network grows more and more is being stored for 'convenience'. Search technologies also make data findable in entirely new ways to accomodate this massive data growth. Nowadays, you cannot move on your computer without leaving a significant trail around. A pity. Word author fields are but an example.
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