ip security against pyracy

hi, i am new to ip core design and i am looking for a way to protect my work when i submit it to customers for evaluation. i know creating the vhdp file will hide my work from customers while trying it. but does it allow the customer to deploy the design on fpga. i want to know how can i submit my work for evaluation with out the customer be able to use it on actual hardware for commercial purpose or be able to use it for limited evaluation time.thanks