July 2015: Now that Windows 10 is RTM, is strongly recommend upgrading your SCCM infrastructure to the appropriate service pack. SCCM 2012 SP2 (or SCCM 2012 R2 SP1) provides native support for Windows 10. If you experience issues past the Service Pack upgrade, please consult your Microsoft Support contacts.
With Windows 10, you do not need to deploy SCEP as SCCM Can now manage Windows Defender out of the box: https://technet.microsoft.com/en-us/library/hh508770.aspx
Leaving this workaround up now that a supported process is in place, I fear that some may try to implement this non-support workaround in a production environment.