They sell basically three things: rights (and some specifications) to design your own chips with their interface, rights to use their core designs in your SoCs,

They sell basically three things: rights (and some specifications) to design your own chips with their interface, rights to use their core designs in your SoCs, and services related to those two things. > What's the business model? Do they get paid per ARM chip sold, or yearly for the rights to sell ARM chips, etc? Either or both.