English to Spanish Law/Patents Music

¡Esta es la penúltima pregunta... creo! Me estoy volviendo loca... ¿Alguna sugerencia sobre lo que quieren decir? Millones de gracias.

Contexto:

A responsibility of the agency for demands, which come up from the agreement connection between the organizer and the artist, which exists because of legal rules against the artist, are impossible. The organizer is not entitled to assert such demands against the claim of the agency fee or against the fee of other artists, which are arranged by the agency, as far as the keep back rights are valid.