in relation to a design, means—
| (a) | the author of the design; or |
| (b) | where the author of the design executes the work for another person, the other person for whom the work is so executed; or |
| (c) | where a person, or his employee acting in the course of his employment, makes a design for another person in terms of an agreement, such other person; or |
| (d) | where the ownership in the design has passed to any other person, such other person; |