According the site's terms of service, users may upload videos only if they have the permission of the copyright holder and of the people in the video. Pornography, defamation, harassment, commercials and videos that encourage criminal conduct may not be uploaded. The uploader gives YouTube permission to give out and change the uploaded video for any purpose, and they do not have permission anymore when the uploader deletes the video from the site. Users may view videos on the site but are not allowed to save them on their computers.