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I have a school logo that does not have any copyright claim to it, nor do I question its authenticity. However, while I can upload and re-upload the image, it seems that I have absolutely no idea to protect it, nor to add a CC, Attribute, or whatever license to make sure it stays on the school's page.

Most students nowadays, when passing papers and reports, are required to insert the school's logo on the front page of their reports.

Further research suggests that this is the logo used for official school documents. http://i45.tinypic.com/34fo3ll.jpg