Do all authors need to sign the Publication Agreement Form?

Yes, all authors must provide signatures on the Publication Agreement Form (also called the License to Publish form). The form is distributed using Dropbox Sign (formerly Hellosign) upon acceptance of your manuscript, and must be signed before publication.

See also:

• JMIR Publications' Digital License to Publish (via Dropbox Sign)
• Who should be listed as author and sign the publication form? (authorship criteria)
• How to change (add/drop) authors after peer-review but before publication