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about the Raspberry Pi trademark.
The issues regarding gnu-based operating systems are different. If you don't understand the licenses that cover their use it would probably be better to find a lawyer who does.
As a pedantic nit-pick - it is not practically possible to sell a Raspberry Pi with an "inbuilt OS." The OS has to be booted from an SD card, so unless you fix it with superglue it will always be possible to remove it. The established Raspberry Pi vendors have been offering SD cards with pre-installed Operating Systems for some time - how does your proposal differ?
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