“A ‘mask work’ is a series of related images, however fixed or encoded —
(A) having or representing the predetermined, three-dimensional pattern of metallic, insulating, or semiconductor material present or removed from the layers of a semiconductor chip product; and
(B) in which series the relation of the images to one another is that each image has the pattern of the surface of one form of the semiconductor chip product.” 17 U.S.C. § 901(a)(2). A hreedimensional
design formed on or in the layers of a semiconductor chip. This term does not apply to sculptural masks. Mask works are protected under the Semiconductor Chip Protection Act of 1984 and may be registered by the U.S. Copyright Office.