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I would like to be able to determine if a PDF has layers/OCGs in it using an existing VB.net where we are previewing images.
We have some graphics files that our graphics department didn't turn off a layer with template marks on them.
We can't see them in the preview, but they do show up when actually printed.
When I come across one, I want to be able to alert them to correct the situation.
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You can using JavaScript which you can use from VB. See the SDK for documentation about JSObject