OCR to ClearScan multiple times okay?

Hi guys. Does anyone see any problems with having Acrobat OCR a document more than once? We have pdf files that get appended periodically, and sometimes the appended part has not been OCR'd. So to make sure the entire file is readable and searchable, I would like to run Acrobat 9's OCR text recognition with the ClearScan setting on the entire document. However, OCR will have been run on part or all of the document already.
Will that cause any problems with the PDF file? Is it okay if someone runs OCR on it many times?
thanks,
-Emery

Acrobat will allow you to repeat OCR on a page that was previously OCRed if the mode was originally "Searchable Image" or "Searchable Image Exact" because there is still a bitmap there to use. If ClearScan was used, of if the PDF only contains "renderable text" (because it was converted to PDF straight from the authoring application, for example), then it cannot/will not OCR that page.
So, no, you cannot OCR a given page to ClearScan multiple times, but I think if you just redo the whole file, it will catch the new pages.

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