If you have written a publication, you automatically have copyright in it. You don't need to do anything else for this: no registration or referencing is required. This copyright gives the rightsholder control over the publication. The copyright holder has the sole right to bring their article or book to the public’s attention in any way, either on paper or electronically. These are the so-called exploitation rights. You can assign the exploitation rights to another party, for example a publisher, by means of a contract. You can set conditions, for example 'only for this magazine' or 'only for paper editions'...
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