What are the restrictions for organizing licenses under multiple separate Master Licenses?

On the FAQ webpage for "MathWorks License System Transition", it states, "You can choose to organize all your licenses under a single Master License or to have multiple separate Master Licenses (some restrictions may apply)."

Please elaborate on the restrictions for organizing licenses under multiple separate Master Licenses.

[Cameron Hess]

THIS FAQ webpage.

http://www.mathworks.com/support/faq/new-license-system-transition-faq.html?refresh=true