09-01 “Metadata” refers to electronically stored information about electronic documents. Metadata often is included in files that are stored electronically. It may be apparent on the face of an electronic document, or may be hidden. Some metadata may be innocuous and unimportant, revealing basic information about dates an electronic file was created and edited. On the other hand, however, sensitive and confidential information, including comments reflecting attorney-client communications and tracked changes revealing work product, may also be contained in metadata embedded in electronic documents. When documents are transmitted and received electronically, tools may be available that enable the recipient to search for hidden metadata.