Is money earned considered lawful or unlawful if it results from a work method learned from paid courses that were stolen and made available for free?

Transgression upon the rights of the owners of stolen courses is not permissible. However, the knowledge and expertise gained from them are permissible. If they are used in a permissible work, then the earnings are permissible. The transgressor upon the rights is blameworthy, yet it is lawful for him to earn from the permissible work he learned from these courses.