What is the ruling on working for a company that uses unlicensed software, and what is the ruling on the salary saved from this work, and what is the ruling on using pirated software for learning and personal benefit, and what is the ruling on selling computers with a pirated operating system installed, provided the customer is informed of that?

It is impermissible to use copyrighted software without the permission of its owners. If you are asked to work with such programs, it is not permissible to accept, as this would be a participation in the transgression against the rights of others. It is permissible to trade in computer hardware, but it is not permissible to install non-genuine software on them.