If someone wants both commercial and ownership rights of your work, double your rates at minimum. 50% increase for one or the other at minimum. Because losing the right to own or reproduce your own work is a big ask.
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50% at minimum just means increase by 50% or more if you want to? Its intended to mean that if the client wants one or the other types of rights (commercial or ownership) then you make minimum 50% more money on your base rate. If they want both ownership and commercial rights, double your base rate (increase by 100%)