A new self-service surgical retractor with the characteristics comprising: main post, lock sleeve, lock operating lever, take-up device lock sleeve, take-up device and hook plate. The cover stock avoids any discoloration upon long-term UV exposure and is easy to mold. When the user selects a different panorama for viewing from a different camera, this panorama comes up in the same state as the panorama previously being viewed. At least one of the characters in the character string may be selected from a character table describing characters prepared to create the test data so as to achieve the determined total sum for each element of the signature. In some embodiments, the online content editing server utilizes proxy content during creation and modification operations on the user-created content, and replaces such proxy content with corresponding higher definitionquality content, possibly when the user-created content is published for consumption, or when the user has paid for the higher quality content.