Does DLP use securefile storage for LOBs?
No, as of version 12, we are still using basicfile storage for LOB data. Securefile is the default storage type for LOB data in Oracle Database 11g, however this is a feature we are not using and 11g is the first generation that made this storage type the default. Therefore, it is most likely that no prior version of DLP makes use of this technology either.
To prove this to yourself or to a customer, login to the database in SQLplus and run:
SELECT table_name, securefile FROM user_lobs;