qpdf/qpdf — pull request #5 by kholia (2012-10-20 06:08:41+00:00)
Title: Add option for specifying RC4 40-bit key instead of password

Hi,

After applying this patch, it is possible to use RC4 40-bit key directly instead of password.

```
./qpdf/build/qpdf --key=9296c944ee --decrypt test.pdf output.pdf
```

```
Get test.pdf from http://dl.dropbox.com/u/1522424/test.pdf
```

This patch is useful since RC4 40-bit key can be cracked in under 3 days (with 100% success rate) on processors like AMD FX-8120.

Cheers,
Dhiru