You may want to check with the rental company and be sure they know you will be going to Morocco. I imagine it is possible, but will almost for sure cost more for insurance as you are outside the rental country. My guess is they will probably not allow you to do it; but it never hurts to ask. If you do not have your permission, do NOT take the car out of Spain as it will not have the international insurance card in it that is required when you come into Morocco.
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