Since we introduced Hierarchical modules for the 5.1 Module Builder release, now there are two sets of permissions - one for the Module (the original permissions set) and one for each Content type.
The global permissions for the module are located in Administration->Permissions->YourModule in the left-hand menu.
And for each content type you can go to Content->YourContentType
and in the right-hand menu click on Permissions - there you can set the permissions per item type (by default we have them set to Administrators only).
Regarding permissions per item level we have a feature request logged in PITS
. Hopefully this will be added soon in a future release. If you want to implement it you need to override many classes depending on your exact requirements. However this has never been tried or tested so we could not guaranty it would work.
the Telerik team
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