Strategy 1: Tag and Track
•Approach:
–put unique serial number on each copy
–record each buyer’s identity
–find unauthorized duplicates
–check serial number on duplicate, blame original buyer
•Can limit copying and dissemination, but not use
•Enforcement raises serious privacy issues
–Must authenticate each buyer’s identity
–Must keep track of who has each copy
–Must monitor dissemination of copies
•This strategy is falling out of favor.