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Issue #399 mentioned a use case for which qpdf has support, but the fact that it is supported was not documented or in the test suite, making it vulerable to accidental breakage.
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Allow exit status-based checking of whether a file is encrypted or requires a password without necessarily supplying the correct password. Useful for scripting.
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For wildcard expansion to work properly with the msvc binary, it is necessary to link with setargv.obj or wsetargv.obj, depending on whether wmain is in use.
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This makes it more likely for someone who notices a big slow-down in page splitting to discover the option.
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Per user suggestion in issue 351.