You can indicate whether your content has copyright by selecting 'podcast settings' in your dashboard menu and scrolling down to the copyright field. This field is mandatory for Apple Podcasts. In The Netherlands your content has copyright by default, but some people also publish content under a Creative Commons (CC) licence.
How to use the copyright field
Write down 'All right reserved' + your name or company name in the copyright field. When your content is published with a Creative Commons license, please submit your license in this field.