Due to licensing changes, a number of geoprocessing tools appear to be locked when viewed in the ArcToolbox window. This applies to system tools contained in custom toolboxes only.
The appearance of the lock symbol on a tool is due to licensing changes that have occurred. Numerous tools have dropped a license level. For example, ArcInfo license was previously required and now only Editor license needed, and so forth. This creates the appearance of the tool being locked.
Tools with a license that has not changed and were locked in the past are still locked.
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