Valid Characters for PDF 1.6 User Password

Hi,
What character set is considered as a valid for user password in Pdf 1.6? I know Pdf 1,6 accepts only single byte characters in user password? Is there any set of valid password characters? I searched Pdf 1,6 spec and adobe forums, but couldn't find anything related to this.
Thanks
Venki

Hi Venki,
Low-bit ASCII will be problem free, but I think that some of the high-bit ASCII characters get interpreted differently between the two platforms. I'm just not sure which ones. Even in Acrobat 9 where the allowable Unicode set is much more robust there are still some characters that the MAC won't allow. I even filed a bug with my counterparts at Apple that if you try to use a Cyrillic keyboard the OS will automatically switch you to a Latin (Roman) based keyboard. They sent the bug back noting that it works "as designed". They are intentionally restricting passwords to Roman characters.
Steve

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