I did paraphrasing, not plagiarism. These are two different things.
When you paraphrase, you use your own words to express something that was written or said by another person.
I do not say that you are bad, but saying that paraphrasing is a form of plagiarism is simply lying, because it is not true. You are the one, who trying to make me look bad.
I do not deserve the downvote.
Good job finding a source on the internet supporting your case. I can do the same.
https://english.la.psu.edu/undergraduate/plagiarism-policy/
https://academicintegrity.uoguelph.ca/plagiarism/types-plagiarism
https://apus.libanswers.com/writing/faq/2389
Edit: I did not downvote you for the act of paraphrasing/plagiarism in itself. I did it because I don't believe you deserve being rewarded for the ideas and content someone else wrote.
You are right in the aspect that I should have mentioned the sources.
Would you still downvote if I would use something licensed under creative commons (CC), GNU, MIT, BSD (or any similar) license, which allows all kinds of (even commercial) usage? I would mention the author and the source, of course.
I would not but if your post consisted of only that I wouldn't upvote it either.
I learned the lesson. If I will use someone else's content, then I will mention the sources.
Have a nice weekend mate. Enjoy a beer if you're into that.