This report is for anyone with responsibility for collections of sound or moving image content and an interest in preservation of that content. New content is born digital, analogue audio and video need digitisation to survive and film requires digitisation for access. Consequently, digital preservation will be relevant over time to all these areas. The report concentrates on digitisation, encoding, file formats and wrappers, use of compression, obsolescence and what to do about the particular digital preservation problems of sound and moving images.