1. To get on overview who already signed the copyright form please go to:
Overview => Submissions & Reviews => List of Submissions
… and click on the tab to "Show more filter options". Then use the "Special Filter" and set it to "Only contributions for which authors have signed the copyright form" (see image 1).
2. To delete the signature of a copyright form, please go to:
Overview => Submissions & Reviews => List of Submissions
… select one of the submissions and then click on “Electronic Copyright Form” (see image 2).
Delete the data in the fields "Signing Author or Authorized Person" and "Date of Signing" and click on "Submit Copyright Form" (see image 3).