Restricting the allowed component to a single component

[#1]

In AEM 6.3, is there any way to restrict the author to a single allowed component ?

or if i create a policy , is there any way to lock the policy so that author doesn't go about and add further allowed components ??

[#2]

In AEM 6.3 - you should use Editable Templates and then define the components that are allowed in the Layout by using a policy. Once successfully done - the allowed components will show up in the editable template layout section.

Authors should not be allowed to modify template policies.

[#3]

Anyone reading this thread (users who have older versions of AEM for example) and want to know HOW TO use editable templates within AEM - see Adobe Experience Manager Help | Creating an Adobe Experience Manager 6.4 website using Editable Temp...

[#4]

can authors be able to modify the policies ?
or access the policies ??

[#5]

If author go about & consequently modified the policies to add couple of additional allowed components , is there any way to restrict (except for one component) addition of others by displaying a popup mentioning that " This component could not be added " ??

or is my approach wrong ?

Also it would have been helpful to know , where the policies are stored ?

[#6]

You can always setup groups and place authors in a group that cannot modify editable templates.

All editable templates info is stored in the JCR here -- /conf/<PROJECT_NAME>/settings

[#7]

Thanks a lot.
Appreciate the sudden response.