Filing a document ?under seal? is a way that a document's information can be kept hidden for a specified period. Documents under seal may be placed in an envelope and stored somewhere secure such as a safe until the seal can legitimately be broken and the information revealed.
When a document is redacted, it means that certain text contained in a document filed with the Court is concealed from view for privacy protection.
Filing under seal is a procedure allowing sensitive or confidential information to be filed with a court without becoming a matter of public record. The court generally must give permission for the material to remain under seal.