Originally Posted by snakeair
You can remove it if you have permission from the plugin or theme creator to do so.
Who told you that ?
its not necessary unless agreed before.
most of the themes are downloaded from sites which host free wp themes, there is only download link available, no agreement.
Also the developers nowadays intend to promote their websites by providing free themes, they do not have any particular legal arrangements.
If you do so they cant do anything???
but its upto you, but i always do to avoid un-necessary flow of pr
from my sites