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 ;-),

In reply to Re^3: Extract page layouts or crop box height and width from pdf by john_oshea
in thread Extract page layouts or crop box height and width from pdf by anniyan

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