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Thank you for your question.
I think they are mistaken,
says that authors economic rights can be assigned and transferred and sold.
If there is any doubt, you can specify in the contract that the contract is to be governed by the laws of your home State and not the laws of Egypt.
There are intellectual property attorneys in Egypt listed by location here. You can double check my answer with one of them to be sure.
I hope this information is helpful.
Please let me know if I have not answered your question prior to rating my answer.