From the Guiding Rights Blog:
“A recent Illinois trade secret decision highlights the security measures companies should take to preserve proprietary rights in customer lists…
1. Limit computer access on a need-to-know basis.
2. Restrict access to physical copies.
3. Prevent employees from taking copies when they leave the company.
4. Require employees to sign confidentiality agreements.
5. Advise employees that lists are confidential.
6. Label the lists as confidential.”