06-23-2020, 12:05 PM
No hard rules. The owner keeps the copyright, so as long as you don't redistribute them, you can do whatever you want.
If you post one in a forum, the worst that can happens is a take-down notice (sent to the forum admin...).
Otherwise, it can depend on the rules of the site where you found the picture. Some picture sites required that posted material is CC-BY-SA or better, so you are fine as long as your own derivative is also CC-BY-SA.
If you post one in a forum, the worst that can happens is a take-down notice (sent to the forum admin...).
Otherwise, it can depend on the rules of the site where you found the picture. Some picture sites required that posted material is CC-BY-SA or better, so you are fine as long as your own derivative is also CC-BY-SA.