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I've developped the Xmp Php Tookit extension : it's a php5 extension based on the adobe xmp toolkit, which provide the main classes and method to read/write/parse xmp metadatas from jpeg, psd, pdf, video, audio... This extension is under gpl licence. A new release will be available soon, for php 5.3 (now only compatible with php 5.2.x), and should be available on windows and macosx (now only for freebsd and linux systems). http://xmpphptoolkit.sourceforge.net/