Type of license described by the element.
| Value | Meaning |
|---|---|
| Text, numbers, or special characters | The type of license, for example, “ open-access ” for a license permitting unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited; or “ ccc ” for a Copyright Clearance Center statement. |
| Restriction: This attribute may be specified if the element is used. | |