‘Fi’ or ‘Cr’ symbol in preview

Hi,

I can't find an explanation for this online:
Images generated in Firefly with a Firefly model via a command prompt have a ‘Fi’ symbol on the Firefly-Board, which stands for ‘commercially secure’.
If I want to have more of the background in this generated image, for example, the ‘Fi’ symbol changes to a ‘Cr’ symbol, which no longer stands for ‘commercially safe’. The situation is similar when generating variants: some have an “Fi” and others a ‘Cr’.
My questions:
1. Can I only use images with the ‘Fi’ symbol commercially?
2. If only ‘Fi’ images are commercially usable, why are images modified with the same AI model no longer commercially usable due to the ‘Cr’ symbol?
3. How can I legally prove that I have legally acquired a Firefly image?

Thank you in advance!