Cannot copy from pdf and paste to notepad


I'm viewing a pdf with Adobe Reader 7.0. I select some text, copy to clipboard and then paste it in notepad or word, but what appears is little boxes and not the original characters.
How can I correct this?

Thank you
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Karl Heinz KremerConnect With a Mentor Commented:
The PDF file does not contain all the information to extract the text. The problem is that a character in a PDF file may not contain information what "real" character it relates to. Some PDF generators do a pretty bad job when they embed fonts into PDF files. They use a proprietary encoding mechanism (e.g. 1 is A, 2 is B, 3 is C, ...) in both the embedded font and when they place glyphs on the page. Without a table that implements the reverse (e.g. character code 1 is 'A') you cannot extract text from such a file.

There is nothing you can do (besides to complain to whoever created the PDF file, and the author of the software that created this file).
I should like to know which free PDF generator might be satisfactory.  PrimoPDF is the culprit in my case.
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