Commercial use of arduino code.

hello, have been wondering if there imposibilities or requirements make commercial use of arduino code. have been paid make dvelopment , arduino mega2560, , want make dedicated board design, making. so, if make schematic design atmega2560 , burn bootloader on can use code wrote, know, there inconvenient if want sell board, , make mass production of it? don't know these limitations, not seen in country. possible use code in manner? or should make new development in environment? know as can this.

thanks in advance.

maybe if posted in gigs & colaborations section might know.

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