There is in practice confusion between remuneration for a creative process and the use of the work that is the result of this process.
The fact that a client or an employer pays an author to create something does not automatically have the consequence that the client or the employer may freely make use of the work created by the author.
They are two different things.
Thus, for example, payment for the services of an independent developer to create a computer programme does not give the client the right to use the said programme, in particular, by granting its own customers a license of use.
The same goes for performances created by artists. Payment for the performance does not give the employer or commissioner the right to make use of the performance.
Thus, for example, payment for the performance of an artist appearing on stage at a concert does not give the organiser of the event the right to record the concert and sell the recording or reproductions thereof.