Why is it not possible to highlite text inside every PDF?

Hey guys,
Does anybody know why I cannot highlight text inside a few PDFs?
I know already the following:
If you scan a document and save it as a PDF, it is normally an ordinary picture and therefore you cannot highlight anything. However, I can highlight text inside some scanned PDFs. I assume that somebody (who and how?) used some sort of OCR software. If that is the case, Adobe Reader recognizes the “picture” as text and you can mark easily. So far so good.
The questions are: Who has to enable OCR scanning? Does Adobe Reader itself has a feature for OCR scanning? If I got a document, which is not yet “OCR scanned”, is there a possibility for me to enable OCR and therefore highlight the text afterwards?
Thanks in advance for your help (and excuse any language mistakes)!
Julian

Adobe Reader can't perform OCR. Adobe Acrobat has this feature.

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