This means that you are to not move or remove the credit. You are to not move it on another/secondary page.
This means you are not to post my theme again. You are not to copy it nor steal it.
This means you are not to take my themes, repost it, and make it as your own. This rule is similar to the previous one.
This means you are not to take anything from my themes (even my unpublished ones) and use it as a base to make your own one. That is stealing, and stealing is bad.