Wrapped files are not downward-compatible between Oracle Database releases.

For example, you cannot load files produced by the version n.1 PL/SQL Wrapper utility into a version (n-1).2 Oracle Database. Nor can you load files produced by the version n.2 PL/SQL Wrapper utility into a version n.1 Oracle Database. Wrapped files are both upward- and downward-compatible across patch sets.

Wrapping PL/SQL source text is not a secure way to hide passwords or table names.

For high-assurance security, use Oracle Database Vault, described in Oracle Database Vault Administrator's Guide.

You cannot wrap the PL/SQL source text of triggers.

To hide the implementation details of a trigger, put them in a stored subprogram, wrap the subprogram, and write a one-line trigger that invokes the subprogram.