Is there any way to mark an application contents (Rules/Process Models/Reports)

Karthik,
If the user is a system administrator, he would be able to modify all the artifacts in the server.
User should be a basic user and should be part of the Designers group.
Then you can set the security as Viewer for the individual artifacts to make them read only.
Setting the Viewer only in Application will not help.

Eg: If you have the Rules Folder with Administrator access for the user and if you set the Viewer access in the application level, it will not help.

Karthik,
If the user is a system administrator, he would be able to modify all the artifacts in the server.
User should be a basic user and should be part of the Designers group.
Then you can set the security as Viewer for the individual artifacts to make them read only.
Setting the Viewer only in Application will not help.

Eg: If you have the Rules Folder with Administrator access for the user and if you set the Viewer access in the application level, it will not help.