Courts have held that a copyright owner may dedicate a work to the public domain simply by manifesting the intent to do so through an overt act. A signed document is not absolutely required. Thus, including a statement in a video that the work is dedicated to the public domain would likely be sufficient. However, to avoid possible disputes and misunderstandings, it is always best for the copyright owner to sign a document dedicating the work involved to the public domain. Such a document need not be long or fancy. The Copyright Office says that it need only:
- identify the work involved--preferably including the author(s), title(s), and registration number(s) for the work (if any)
- provide the copyright owner’s full name and state that such person is the current owner of the copyright in the work
- state “I the copyright owner of this work, hereby release it into the public domain,” and
- be signed by the copyright owner or co-owners or by an authorized representative.