By default, the Import utility imports any object grants that were exported. If the export was a user-mode export, then the export file contains only first-level object grants (those granted by the owner).
If the export was a full database mode export, then the export file contains all object grants, including lower-level grants (those granted by users given a privilege with the
WITH GRANT OPTION). If you specify
GRANTS=n, then the Import utility does not import object grants. (Note that system grants are imported even if
Export does not export grants on data dictionary views for security reasons that affect Import. If such grants were exported, then access privileges would be changed and the importer would not be aware of this.