Is it permissible to sell a foreign course that was purchased at a high price, at a lower price to others, with the intention of buying other courses for personal benefit and equipment in the same field, knowing that the value of the sales does not cover the original cost of the course, and there were no conditions preventing the sale at the time of purchase?

If the course is copyrighted, it is not permissible to sell it to others, as this would lead to the infringement of the financial and moral rights of its owners. Copyright, invention, and innovation rights are protected by Islamic law, and it is not permissible to violate them. Their owners have the right to dispose of them. It is well-known that course owners prohibit their sale, and what is well-known is as good as a condition. You can contact them to inquire about their permission.