default public packages

Hi

I am configuring security parameters by following CIS Oracle Database Server 11 - 11g R2 .Here It is mentioning revoke default packages from public below,

DBMS_ADVISOR
DBMS_CRYPTO
DBMS_JAVA
DBMS_JAVA_TEST
DBMS_JOB package
DBMS_LDAP package
DBMS_LOB package
DBMS_OBFUSCATION_TOOLKIT
DBMS_RANDOM
DBMS_SCHEDULER
DBMS_SQL package
DBMS_XMLGEN
DBMS_XMLQUERY
UTL_FILE
UTL_INADDR
UTL_TCP
UTL_MAIL
UTL_SMTP
UTL_DBWS
UTL_HTTP
UTL_ORAMTS
HTTPURITYPE

before taking any action i want to be sure whether it will make any effect on DB.If anybody knows about these security packages please advise.

Oracle Release :- 11.2.0.2

Thanks

Regards
Anas