Sometimes the question comes up, what copyright notice to use when creating a compatibility module?
When a file is very similar to one found in one of the Hyvä core, retain the Hyvä copyright notice:
If the file content is not a copy, but rather created from scratch and contains mostly unique code, feel free to use either the Hyvä copyright notice, or your own one.
In that case please add a line that allows the code to be used with Hyvä installations.
Feel free to modify the above example as appropriate.