When making changes to an Apache licensed file, one should amend the file header:
Copyright 2022 Me, Myself & I
There is the possibility to add the suffix "Not a contribution":
Copyright 2022 Me, Myself & I. Not a contribution.
What does this actually mean? From the license itself:
"Contribution" shall mean any work [...] that is intentionally submitted to Licensor [...]. [...] "submitted" means any form of [...] communication sent to the Licensor [...] excluding communication that is conspicuously marked or otherwise designated in writing by the copyright owner as "Not a Contribution."
When would this be a good idea to do so, and what's the consequence?