Hide views from user

Hi all,

I would like to hide the views of an entire package to the data base user (USER1).

However, the user should be able to execute procedures that accesses these views.

How can I do it?

To define the procedure with 'SQL SECURITY DEFINER' did not help.

When USER1 executes the procedure, the procedure can access tables where USER1 has no SELECT privileges for but  it cannot select on views that USER1 cannot see.

Thanks

MArkus