RE portlet.xml security-rol-ref

[Manikantha Rajamani, modificado hace 10 años.]

Hi all
I have created one portlet but I adsorved the following tag in portlet.xml
< security-role-ref>
<role-name>Administrator</role-name>
</security-role-ref>

< security-role-ref>
<role-name>Guest</role-name>
</security-role-ref>

< security-role-ref>
<role-name>powe-user</role-name>
</security-role-ref>

< security-role-ref>
<role-name>User</role-name>
</security-role-ref>

If I comment the following code in portlet.xml file then also all role user can view the portlet which i have developed
then What is use of following code in portlet.xml...