- Update to version 8.1.0
Usability improvements:
* When splitting files, qpdf detects fonts and images that the
document metadata claims are referenced from a page but are
not actually referenced and omits them from the output file.
* When merging multiple PDF files, qpdf no longer leaves all
the files open.
* The --rotate option's syntax has been extended to make the
page range optional. If you specify --rotate=angle without
specifying a page range, the rotation will be applied to
all pages.
* When merging multiple files, the --verbose option now prints
information about each file as it operates on that file.
* When the --progress option is specified, qpdf will print a
running indicator of its best guess at how far through the
writing process it is.
Bug fixes:

* Properly decrypt files that use revision 3 of the standard
security handler but use 40 bit keys
(even though revision 3 supports 128-bit keys).
* Limit depth of nested data structures to prevent crashes
from certain types of malformed (malicious) PDFs.
* In “newline before endstream” mode, insert the required
extra newline before the endstream at the end of object streams.
Please see included ChangeLog for complete changelog including
API changes.