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How to search and grab content from pdf files?
If it is an electronic PDF, can it be correct? Its content is searched or crawled. What if? If it is a pure scanned version, it is not allowed.

If you use Adobe Acrobat XI Pro to create a PDF scan to generate a double-layer PDF document, you can check the following options in the scan to make the content searchable, and then you can check? Its content is searched or crawled.