On Jun 17, 2008, at 9:30 AM, Jian hua huang wrote:
I used PdfReader.getMedata() to get XMP out a PDF file and it works
fine when a PDF file is not encrypted or has no restrictions (such
as No Print).
When a PDF file is encrypted or has restrictions on it, I get
exception if I don’t have owner password.
That is correct, since the default (and only option until PDF 1.4)
was to encrypt everything.
According to PDF Spec 1.4, if you encrypt a PDF document, you can
choose to no encrypt its metadata streams. In other words, the PDF
content is encrypted but metadata streams are left as plain text. I
still get the exception from PdfReader.getMetadata() method if my
PDF file is only encrypted on its content.
As you note - YOU CAN CHOOSE...
Most users don't make this choice (unfortunately).
Leonard
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