| 摘要 |
<p>A method and system for providing copy-protected optical medium using a substrate having information stored therein in information pits (5) and information lands (10, 11), wherein the information lands (10,11) comprise lands in two different planes. A reflective layer (12) covers the information lands (10) and an optically-changeable security material (16) is applied over the reflective layer (12).</p> |
