There's no requirement to divulge confidential information. As a trivial example, you could change this real input and output

$ perl -E 'say "Eyes Only: $ARGV[0]"' secret_info
Eyes Only: secret_info
[download]

to this example input and output

$ perl -E 'say "Eyes Only: $ARGV[0]"' fred
Eyes Only: fred
[download]

I've asked questions which you haven't answered and raised points which you haven't addressed. It's up to you whether you want to help us to help you. I choose not to engage in any more guesswork.