Copyright year

[mupfdev]

Apparently you changed the copyright year from 2017 to 2020 but the year of first publication should be set out. It is a common misconception that the current year should always be given.

The general rule is that the year to include in a copyright notice is the year of first publication of the work. First publication is when the work is made available to the public without restriction. This includes selling a book or leaving free copies of it in a public place or posting content on your blog. Publication does not include, for example, circulating copies internally to co-workers or sending copies of a book to a publisher.

For compilations or derivative works which incorporate previously published content, the year of first publication of the compilation or derivative work is sufficient.

Source: Which Year Should You Use in Your Copyright Notice?

Best regards, Michael