copy protection

[Byron Turner]

This week we got the results of the first adoption of our flagship 
product Created Equal: Sex and Gender.  The professor is using it as a 
text in a class of 33.  Only 22 students bought it.  While a couple 
students are sharing materials, the rest I fear is theft.  In 2 weeks 
it will be used in another class of 70-100.  Any suggestions about how 
to go about copy protecting our product.  (It ships on 2 CDs or a 
single DVD in case that's relevant)

Byron

H. L. Mencken:

As democracy is perfected, the office of president represents, more and 
more closely, the inner soul of the people. On some great and glorious 
day the plain folks of the land will reach their heart's desire at last 
and the White House will be adorned by a downright moron.