just do like a "chop" on ur IC across ur IC copy by using photoshop
mention ur info such this IC copy for whom from where...
so they wont misuse ur copy to do illegal stuff...
and the IC copy should in black and white too to avoid duplicate another fake IC

example:
__________________________
For prakash11 from Lowyat.net
Product: ABC, Date: 24/Nov/06
__________________________