macOS keeps copy of printed files

When printing seeds or SSKR with the macOS version of SeedTool, there is a security risk to users as apparently macOS keeps a copy of all completed printed files in:

```
/var/spool/cups/FILENAME /Users/USERNAME/Desktop/FILENAME.pdf
```

…and does not delete them.

see: https://bgr.com/tech/macos-saves-a-copy-of-every-print-you-have-ever-taken-heres-how-to-find-them/

Obviously the user could

```
sudo rm -r /var/spool/cups
```

but supposedly…

```
sudo service cups stop
sudo service cups start
```

…might be safer.

Don't know if there is anything an app can do to prevent this archive.

I don't know if there is an equivalent problem with iOS.