You can keep that. Noone has protected the tick since fall of Commodore, it has been used for 20 years by anyone without the need for any license - it's abandoned and public domain.
The red/white beach ball can't be Amiga Inc's property either, it was used as a product logo by a hardware vendor for A1000 products in 1985/86.
Therefore nobody else can do anything other than buy said company's rights (which Commodore didn't do) if they want to stop EVERYONE using it.
Also you can't stop someone calling a computer "A.M.I.G.A" as they are initials, as long as you define the five letter acronym and none of the A letters stand for the word "amiga".
And yes the font used by Commodore for the word "Amiga"can not be objected to as it is royalty free

:banana: