There should be a permission to publish work before it can be done; this permission should be obtained from the author to avoid litigation and violation of the law. In addition to this, duly noted should be that any rights of exploitation are to be observed, thus making an inquiry about such rights in collecting societies makes sense.
First Step to Take in the Case of Copyright Infringement
If an author believes that his copyrights are being infringed, he should write to the person who violates them setting a deadline to retract the publication or to demand payment of a defined financial contribution for publication to the author in accordance with the exploitation rights. Damages may be required from a person who publishes the work, but still not ready to recognize the copyright.
If there is a question of whether copyright exists or not, disagreement, it is advisable to advise the two opposing parties before seeking legal action, first of all seeking competent legal advice from a copyright lawyer. Nevertheless, if a legal proceeding is unavoidable, due to the complex matter and the often quite high amounts in dispute, usually a lawyer is required or even prescribed by law as legal counsel.
In a brief description of the copyright situation, it can already be clarified in a piece of first lawyer advice, what are the chances of success, if you want to assert your right against an alleged author.
You have to seek a legal counsel or advice to be able to settle the matter discreetly, and if it gets out of hand, then the lawyer will be at your disposal to handle the case efficiently while giving you the best options that can help your case. Copyright issues happen a lot, and you have to be ready to handle such cases.