I have released qpdf 4.0.0. The big change in this version is support for the newer encryption schemes used by Acrobat IX and X. Also in this release is support for extension levels in PDF version information, new methods for supporting read and write from/to arbitrary sources, support for unencrypted files with encrypted attachments, and support for files with junk preceding the PDF header. There are also a few minor bug fixes and some API changes. For details, see the release notes at http://qpdf.sourceforge.net/files/qpdf-manual.html#ref.release-notes.
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