The solution was to just get an updated version of copy2pc or copywrite and they would have a fix.
But I remember a few schemes that were interesting workarounds.
One was the hole in the disk, one was a laser-burned dot on the disk.
I recall with the hole in the disk - the software would try to read and if it succeeded it was a copy.
The second one was slightly different and I believe the software would write to it, and read it back, and if it could read it back it was a copy.
However the best of all was either the scratch-n-sniff card from Leather Godesses of Phobos, or the Age Verification of Leisure Suit Larry.
example:
"Gone With The Wind" is about
a. outer space.
b. a bank robbery.
c. four hours long.
d. dust.
or President Ford prescribed _____ for dealing with economic problems.
a. tranquilizers
b. employment
c. that everyone wear a WIN button
d. that everyone should have a nice day