For all online works other than computer programs and databases, the registration extends only to the copyrightable content of the work as received in the Copyright Office and identified as the subject of the claim. The application for registration should exclude any material that has been previously registered or published or that is in the public domain. For published works, the registration should be limited to the content of the work asserted to be published on the date given on the application.
Many works transmitted online are revised or updated frequently. For individual works, however, there is no blanket registration available to cover revisions published on multiple dates. A revised version for each daily revision may be registered separately, provided the revisions constitute copyrightable authorship. A separate application filing fee would be required for each separately published update.
For details on how to register online works, please see Circular 66, Copyright Registration for Online Works.