The copyright we include in our outputs should be a range, where the first year is the date the output was first produced and the second year is the current publish date. Use this task if you have not already set up your existing publications to show a copyright range. The copyright appears in the legal page and in the footer of outputs.
Copyright ranges can be different across books within a project. For example, you might have a new book created for a 2016 release, which would have a copyright of 2016. And you might have another book that’s been published since 2012, which should have a copyright range of 2012–2016.