If you are using Quartus Prime Pro, you can encrypt RTL codes by using IEEE 1735 Encryption.
We do not receive any response from you on the previous question/reply/answer provided. Please login to ‘https://supporttickets.intel.com’, view details of the desire request, and post a feed/response within the next 15 days to allow me to continue to support you. After 15 days, this thread will be transitioned to community support. The community users will be able to help you on your follow-up questions.
p/s: If any answer from community or Intel support are helpful, please feel free to mark as solution, give Kudos and rate 4/5 survey