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OCR Basic is built upon the open-source Tesseract OCR engine, where as OCR Pro is built upon a commercial OCR engine. OCR Pro supports more languages and more input and output options. Check here for a detailed comparison and the difference in pricing options.
Note that Server-side OCR pro Is no longer supported since version 17.0. And client-side OCR Pro requires a trackable license. The traditional product key no longer works.
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