What is the ruling on the salary paid to a computer instructor in a training center that uses unlicensed software?

Using copyrighted software without the owners' permission is not permissible. Consequently, work that relies on such software is impermissible due to its infringement upon the rights of others. However, the salary received for this work is lawful because it is a wage for a service that is originally permissible, even if it is tainted by the sin of aiding in the infringement or the sin of using that software.