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Optional Content Groups (OCG) are referred to as "layers" within Adobe Acrobat and Reader and can be used to separate and manage content or graphics on a single page.  Layers are a very useful way to present information when opening a PDF file. In selecting layers (optional content) for processing, PDF Alchemist will use the default OCG state. That is, the output will reflect the layers that are visible by default when opening the PDF file.