Manually adding metadata to pdfs

I'm sorry to be back so quickly with another question but I thought it'd be better to post it as a separate thread.

The metadata-retrival feature is a researcher's dream; my question is how to 'manually' add the metadata to the files for which it does not work - without creating a separate entry. In other words, if the pdf is in the database without the metadata - can it somehow be imposed over it?

Thanks again.
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