Copyrights are held on intellectual property. They can be images, phrases, music, or even coding styles. If you find a good explanation of something provide a link to it in your article, do not copy it from the web page without permission.
Images
You CAN NOT post the following images:
1) Artwork done by someone other than yourself
2) Direct linked images
You CAN post the following images:
1) Images from approved affiliates of Zelda Wiki
2) Nintendo drawn images
3) Drawings you did yourself or with permission
Content
ANY content taken from another website is strictly forbidden unless you have permission from that website. If anyone believes that you have stolen content from another website they are allowed to edit your post to say "The post contained stolen content and was removed", but they will have to provide a source to prove so.
For further info and help contact any Zelda Wiki:Staff.