You must have SECADM authority to remove the security policy from a table. To remove the security policy from a table you use the DROP SECURITY POLICY clause of the ALTER TABLE statement. This also automatically removes protection from all rows and all columns of the table.
In a table that has protected rows every row must be protected by a security label. There is no way to remove LBAC protection from individual rows.
A column of type DB2SECURITYLABEL cannot be altered or removed except by removing the security policy from the table.
Protection of a column can be removed using the DROP COLUMN SECURITY clause of the SQL statement ALTER TABLE. To remove the protection from a column you must have LBAC credentials that allow you to read from and write to that column in addition to the normal privileges and authorities needed to alter a table.