It doesn't matter, when you've made something new: copyright will apply. Copyright gives you a certain assurance that it's your work, so one can just copy it. Only you can decide on the distribution of your work, and it will protect you against the abuse of your work. Keep in mind, because of copyright people stay in creative and innovative work.
Article 1, according to Dutch Law, copyright is defined as follows:
Copyright is the exclusive right of the creator of a work of literature, science, art, or the creator's assignee, to order to publish and reproduce, subject to the limitations prescribed by Dutch law.
From the moment you've written or built something unique, you as the creator will have automatically copyrighted that creation. However, this right doesn't have to stay in the creator's hands. It can also be that the creator has decided to sell the rights of that particular work to someone else or created something in the service of a company. Moreover, the creator could also die in which case the copyright will be surrendered to the heirs of that person. From that moment on, they are the new copyright holders.
The term copyright can be seen as two different sub-rights: the right to publish the created work and the right to distribute the created work. These rights ensure that no one can simply publish or distribute somebody else's work. Only people with permission to do so are free to publish or distribute the work of the creator.
For people using Stuvia, this means that you're only allowed to upload Study Material if you're the copyright holder of those documents. When uploading a document, you hold all the rights of that particular document. People uploading their Study Material always stay copyright holder and do not ever - by using Stuvia - give away their rights. They can adjust, delete, share for free, or choose to sell their documents. Note: by selling their documents, this will not mean they also sell their copyright. Thus, the buyer is only allowed to use the documents for personal use and Stuvia is not responsible for the documents shared via the Platform.