Preface

License

©-info is an icon found on websites or articles, brochures or other PDF documents clicking on which shows easily you the author details and usage rights. By clicking on the icon, you can find out who made and produced the content: images, articles, videos and other material. The information also includes whether the content and material can be used or copied in teaching or other work-related use, for example. (https://www.c-info.fi/en/what-is-c-info/)