In ArcGIS 10.2 for Desktop, a colleague compressed a file geodatabase and then zipped it and sent it to me via email.
I unzipped it and was unable to add any of the feature classes into my map document.
I received this error: "Open Failed. Error opening feature class. Cannot access secured data."
I uncompressed it in ArcCatalog and got the same error when trying to add the data to ArcMap.
This also happened when the colleague zipped the uncompressed geodatabase.