What is the ruling on using computer programs obtained for free from the internet, knowing that they are produced by companies that sell them, and is there any doubt or unlawfulness in earning money from them?

Information published on websites belongs to their owners, and it is not permissible to infringe upon it. Most websites permit the use of their scholarly materials by copying and downloading for personal benefit only, not for commercial purposes. Copyrights, intellectual property, and invention rights are protected in Islamic law for their owners. It is not permissible to use software for financial gain unless the rights holder grants permission.