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How was the PDf created?
Is it a scan?
If not, then you can't OCR it. At least not with Acrobat.
Basically, Acrobat can only OCR pure graphics. If a page has had any text or other items added, it can no longer be converted. The only work around is to save it to TIFF files, open them in Acrobat to create a new PDF, OCR the new document.
I keep coming across this renderable text issue in documents I am processing for the web, and frankly, the TIFF work-around is not adequate. We pay a lot for Adobe Professional, and expect more than such a lame work-around which hinders the output quality. In addition, this is a tedious solution for large documents as well.
I have found several other posts on the web about this, with some references to Adobe updates fixing this problem. I have tried them all and none work. Very frustrating.
Step one: How was it created?
Step two: Is anything currently searchable in the PDF before you try to OCR?