Hi etabeyta,
The term "Concurrent Use License" means a license to use the applicable Adobe software product ("Software") based on the number of users who can use the Software at any one time when the Software is either installed on a Computer file server and initiated by an individual from another Computer on the same Internal Network as the Computer file server or (ii) on an individual’s Computer but only made available for use when such individual’s Computer is granted permission by a Computer file server over an Internal Network. Concurrent Use Licenses may be subject to higher prices than standard Software licenses available under CLP. The total number of users who can use the Software at any one time may not exceed the total number of Concurrent Use Licenses granted to you for such Software. Notwithstanding anything contrary to the EULA, the term "Internal Network" as used in the EULA shall be expanded to include permission for access by your then-currently enrolled students solely for the purposes of your Concurrent Use License(s). Except as otherwise set forth hereunder, all other terms of the EULA shall govern your use of the Software licensed under a Concurrent Use License.
Please go through this link as it has detailed explanation:
http://www.adobe.com/volume-licensing/policies.html
Regards,
Rajshree