This conversation has been merged. Please reference the main conversation: Lightroom Classic: Blurb Book 'Export to PDF' Not PDF/X-3 Compliant
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PDF/X-3, Acrobat 4 (PDF 1.3) compliant
Your book files need to be in the PDF/X-3 format.
Is the Blurb Connection the only way to get a proper book out of LR5 to Blurb?
This doesn't make sense to me.
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