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"Made In SL. Modified in OS."
Create: to produce (something new, such as a work of art) by using your talents and imagination.
Contribute: to help to cause something to happen.
The Britannica Dictionary

When you copybot, import, and modify something from SL, you are a (most likely uninvited and unwelcome) contributor to something someone else created.

When you can provide proof you are the creator of, and not just a contributor to, an item in OS, then it can be said that you are a verified creator.

Synonyms of Verified:
incontestable, incontrovertible, indisputable, indubitable, inescapable, irrefutable, undeniable, unquestionable, authenticated, confirmed, demonstrated, established, proven, substantiated, validated, actual, factual, genuine, real, sure-enough, true.
https://www.merriam-webster.com/thesaurus/verified

When you ask that your "creation" not be distributed in OS, it's fair to ask to see
1. Validation you are the creator or
2. Validation that you have permission to copy, modify and exclusively distribute something someone else created.

Unfortunately, there is no organized verification or certification process. (Is it even possible?)

Lacking this verification, simply claiming to be the creator of, or contributor to, an item gives you no rights over it.

Correct me if I'm wrong.