Importing a document could result in a big UsedCellRange due to the big range of the imported DataValidationRule cell property. The UsedCellRange calculations should ignore this property. This could lead to a performance diminishment when exporting.
The feature will be available in our official release 2015 Q2.
The feature is going to be included in the next official release Q1 2105.
The feature is available in Q3 2014.
Implement Protection feature.