Basic Sources
4 Halakhic Models for Copyright Protection

Jewish Law and Copyright
Rabbi Israel Schneider, (scroll down to the Economics/Marketplace section) courtesy of "Jewish Law"

Software Copying in the Workplace
A frum employee's dilemna
The issue: Under what circumstances can an employee continue to work for an employer who uses copied software or information etc..?
An employee shares his experiences

Links to Copyright Resources:
The Intellectual Property Law Server: a serious site for both laymen and legal professionals providing resources about patent, trademark, and copyright.

Copyright Law for the layman