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SAP Licenses 
For managing the SAP licenses, the following tools are available as standard.
To use your SAP systems successfully, they must be assigned with lasting SAP license keys, as described in SAP License Keys.
Additional information is available in the SAP Service Marketplace under the alias licensekeys.

http://service.sap.com/licensekeys
With the measurement program (transaction USMM), you can ascertain the number of users and used engines of the SAP software for each system. You can then pass the measurement results to SAP.
Additional information is available in
System
Measurement, and in the SAP Service Marketplace under the alias
licenseauditing.
http://service.sap.com/licenseauditing
Using the License
Administration Workbench, you can consolidate the measurement results of one
or more systems, as described in
License Administration
Workbench. You can then pass the consolidated measurement
results to SAP.
Additional information is available in the SAP Service Marketplace under the alias licenseauditing.

http://service.sap.com/licenseauditing