homas - the IPTC header is your friend. You tag the actual image file using the various IPTC fields and the metadata stays on that image. Flickr reads three of them - one for the image title, another for the image description, and a third for keywords. There are over a dozen fields in IPTC, so you can use a rich variety of metadata should you want. It's my understanding that Stock agencies use IPTC extensively.
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