Here’s a great article by Microsoft’s own Anil Erduran that I found over in our TechNet Wiki. This one talks about Management Packs in SCSM 2012, the different between a sealed MP and an unsealed MP as well as how to easily seal your MP:
As is the case in Operations Manager, all customizations for notification templates, groups, list items, workflows etc. in Service Manager are stored in Management Packs. A Management Pack (MP) can consist of two types;
Sealed and Unsealed.
A sealed management pack has an .mp extension and cannot be modified directly. So Microsoft, other vendors or you can prevent modifications on Management Pack itself.
Unsealed management packs have an .xml file extension and con be modified with SM console, authoring tool or directly within XML file.
For example, if you want to add list items to a list that is defined in a sealed management pack, you have to store these modifications in an unsealed management pack….
You can read the rest of Anil’s article here.
J.C. Hornbeck | System Center & Security Knowledge Engineer
App-V Team blog: http://blogs.technet.com/appv/
ConfigMgr Support Team blog: http://blogs.technet.com/configurationmgr/
DPM Team blog: http://blogs.technet.com/dpm/
MED-V Team blog: http://blogs.technet.com/medv/
Orchestrator Support Team blog: http://blogs.technet.com/b/orchestrator/
Operations Manager Team blog: http://blogs.technet.com/momteam/
SCVMM Team blog: http://blogs.technet.com/scvmm
Server App-V Team blog: http://blogs.technet.com/b/serverappv
Service Manager Team blog: http://blogs.technet.com/b/servicemanager
System Center Essentials Team blog: http://blogs.technet.com/b/systemcenteressentials
WSUS Support Team blog: http://blogs.technet.com/sus/
The Forefront Server Protection blog: http://blogs.technet.com/b/fss/
The Forefront Endpoint Security blog : http://blogs.technet.com/b/clientsecurity/
The Forefront Identity Manager blog : http://blogs.msdn.com/b/ms-identity-support/
The Forefront TMG blog: http://blogs.technet.com/b/isablog/
The Forefront UAG blog: http://blogs.technet.com/b/edgeaccessblog/