So many open source projects enforce the Signed-off-by line in commit messages without assigning any menaing to it. I am not a laywer, but I believe such line bares no meaning unless otherwise specified (and even then it is questionable, at least).

Requring a magical incantation in commit messages is an artificial obstacle for contributing, especially for beginners. If your project does that, try to figure out if you can drop the requrement. Thanks