Problem when copy/pasting from PDF


I use PDFCreator to create a PDF document from Word 2007.  I use the PDFCreator printer, with embedded fonts and no compression.

The PDF is created without any problem, but when I select some text from it and paste it in another Word document (or even in the notepad), some spaces are inserted between some letters.  The spaces are always at the same position if I redo the copy/paste, but there doesn't seem to be a predictable pattern.

Anyone knows why this happens and how I can solve the problem?

Thank you!