in reply to Re^2: Extract page layouts or crop box height and width from pdf
in thread Extract page layouts or crop box height and width from pdf

PDFLib pCOS looks like it'll allow access to the cropbox information. It is, however, commercial software, which may or may not be a problem for you. I'm guessing the price is in euro but I'm not sure, as it shows as '99*' (for the non-server version) in my browser ;-),

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