The document introduces audiovisual archives and libraries, explaining that they collect, preserve, and transmit cultural heritage through qualitative transformations of the audiovisual materials, such as segmentation, description, indexing, and translation, in order to make the resources more relevant to users. These processes turn data into metadata and information into knowledge. The document then outlines the contents of the book, which examines theoretical, methodological, technical, and practical approaches to exploiting digital audiovisual archives through repurposing existing content, building community archives, and using social media for sharing.