Refying PDF with subset embedded fonts fixes text extraction

Hi All,
I know it is not a good idea to (just) refry PDF files (PDF -> EPS -> PDF). Especially when the PDF contains subset embedded fonts. Chances are you will end up with a PDF file which does not contain valid (searchable) text.
I did not know the apposite could also be true. The following zip file contains 2 PDF files echo containing two words: the original and the refried version.
Refried.zip
When selecting text from the original PDF (using acrobat 6 through X) file it contains incorrect text, in this case invalid capitals. If I try the same in the refried version the extracted text is correct.
It seems strange to me that a process which only can result in loss of information "fixes" this text issue. Somewhere the correct text must be hidden in the original PDF file. Not only capitals seem to be effected but also random characters which seem to be fixed once refried.
Could anyone think of an explanation?
Is there a workaround without having to refry the PDF (refrying often results in loss of information). I have no influence on the PDF files I recieve, therefore I cannot embed the full fonts.
I am using de C++ SDK for Acrobat to write plugins.
Any pointers would be great!
Kind regards,
Robert

Thanks again for your reply,
Your explanation makes sense.
I went ahead and removed the tounicode cmap just to see what would happen
if (CosDictKnown (cosFont, ASAtomFromString ("ToUnicode")))
CosDictRemove (cosFont,ASAtomFromString ("ToUnicode"));
As you predicted this fixes some issues and introduces new ones.
The results differed from the refry method, in some cases the refried PDF did not contain extractable text, in other cases the PDF without "ToUnicode Cmap" had no extractable text.
Maybe I could combine the information of different text extraction methods to make an educated gues which one (or combination of) is best :S
I suppose looking at individual textruns (with all its complexity) would not help me either...
Kind regards,
Robert

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import java.io.IOException;
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import com.lowagie.text.DocumentException;
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import com.lowagie.text.pdf.PdfImportedPage;
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import com.lowagie.text.pdf.PdfWriter;
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Please, help me...
Thank you very much...

Thank you very much,
I finally found the solution using the swfContext :
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Refying PDF with subset embedded fonts fixes text extraction

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