III.10.b.

Engineers using designs supplied by a client recognize that the designs remain the property of the client and may not be duplicated by the Engineer for others without express permission.

Code is relevant when:

Engineer has a client
AND
Engineer uses designs supplied by the client

Code is violated when:

Engineer does not recognize that the designs remain the property of the client
OR
Engineer duplicates the designs without permission

Code is not violated when

Engineer recognizes that the designs remain the property of the client
AND
Engineer duplicates the designs with permission