The [bw_copyright] shortcode enables you to display your copyright statement. If the following shortcodes look like a shortcode and the expanded result being a Copyright statement, then oik version 1.10 (or higher) is activated and doing its job as expected.
[bw_copyright] = © Copyright oik-plugins 2011-2021. All rights reserved.
The first year in the copyright statement is determined automatically when using “oik options”. If the from year is not set then it is determined as being the date when the first user was registered on the site. You can override this if you want.
If the from and to years are the same then only one year is shown.