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It may be in the file's properties, or otherwise embedded in metadata.
It varies. In a book, the copyright information is generally on the reverse of the title page; in digital materials, it may be embedded in metadata.
database
a database
Hiding messages in digital data. See http://en.wikipedia.org/wiki/Steganography which will help.
A geographic information system can tie a digital map to a database. The geographic information system is called the GIS. It may also tie real-time photos to the map to help with things like GPS navigation.
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A copyright notice may be in the file's properties, in a separate "read me" or "about" file, or embedded in metadata. Notification is not required for protection.
Email messages and the email protocols by definition are digital. Text is sent as digital characters. Video and audio attachments are encoded digitally.
Ideally, the date and rightsholder will be noted in or on the materials (such as the copyright page in a book, or in the metadata of a digital file). There are also databases of records, many of which are accessible online for free.
Megan Alicia Winget has written: 'Digital media' -- subject(s): Interactive multimedia, Special collections, Digital preservation, Social aspects, Philosophy, Electronic information resources, Libraries, Digital media, Collectors and collecting, Authorship, Information technology, Metadata
Geographic information system