I'm not running any Prosoft apps, so I can't experiment, but I'll hazard a guess that those cookies are placed when your app(s) check for updates, similarly to the way some of my Safari extensions place cookies when I do no more than open my Safari > Extensions pref pane.

Assuming that it's enabled, try disabling Prosoft auto-update-check and see what happens.

The new Great Equalizer is the SEND button.

In Memory of Harv: Those who can make you believe absurdities can make you commit atrocities. ~Voltaire