SQL Server Licensing Behavior

We are aqcuiring SQL Server 2012 using CAL-based licensing model.

We are planning the aqcquisition of more CALs than we need actually, but we have the following doubt:

Will SQL Server block users if we pass the number of CALs aqcquired?

Thanks in advance!

Rogerio Silva .::. MCSE / MCTS / MCSA+M / MCT CompuNext Informatica Recife