The disadvantage to not embedding fonts is that if someone opens your PDF and does not have the fonts you use already installed on their system then the PDF they see will not be shown using the fonts you've selected.
Chris - for a PDF form that will be viewed by users in a browser, would Adobe PDF "native" fonts (e.g., Myriad Pro, Courier Std) still need to be embedded, or are they part of Reader "font library" and therefore automatically recogninzed. (Myriad Pro and Courier Std are not found in my Windows/Fonts directory)
I don't believe so for Myriad Pro. I'd have to look into it to be 100% sure, but off the top of my head I believe that if you only have Reader installed the only fonts guaranteed are the ones mentioned in the PDF spec. I don't have the full list, but it's the really standard ones like Arial and Times.
I know this is a dead discussion but I am having many problems with embedding. Basically (1), after saving as Dynamic PDF with fonts embedded and with permanently replace all fonts I still get weird replacements when the file is opened in Reader. Then (2), when I tried to replace all the substitutions with Arial and Times and NOT embed the PDF still shows some embedded fonts (Myriad, Franklin) when opened in Reader in doc properties. This seems Very buggy?! Is there any known issue and/or workaround. Thanks!