No one with any authority mentioned anything of the like.
This is the link to the US Copyright Office:
U.S. Copyright Office. If you are in a different country, then your country's laws are in effect. If you are worried about copyright infringement, do not upload images.
As far as the "Please, Ask Permission Before Downloading For Any Reason" portion of your signature, you are aware that when I go to a thread where your picture is posted, I have already downloaded the image file, rendering that portion of your signature superfluous, incorrect, and unnecessary. It's technical fact of the way the World Wide Web works, and is part of what is known as "fair use" and in no way violates any copyright law.
Adding, "Please do not edit and repost my images" is fairly standard practice here. I know I do not appreciate others' edits, interpretations, reworks, etc. without specific permission posted in that thread. And it is common courtesy to aske before proceeding with such actions.
As Always, if you need help, seek a mod. There is a red triangle with a ! below each profile next to each post. Its there for you, use it when you feel necessary.
I am not a lawyer, just a site janitor, so if you have any further questions, I suggest you seek legal counsel.