In the high level the WAP push SI (Service Indication) message (the one you described in your post) is a multipart message which consist of PAP part, and SI part.
With OMA DRM separate delivery rights push the SI part of the message is replaced with the content of the rights object file. Also the MIME type of the push message is changed from 'text/vnd.wap.si' to 'application/vnd.oma.drm.rights+xml'
You can see this post for more details about the service indication push message structure.
sami / Forum Nokia Developer Support
Re: What is the different between WAP Push message and WAP push SI(Service Inbox) ?
Can you help me out in my sending drc file as wap push
I used Nokia NMIT to generate the dcf drc and dr files.
I am not able to send this as a content wap push.
I am using nokia 6630 as my test handset
I have changed the content type to wbxml+rights
I have tried this hax
060504 0B84 23F0 20202006033F3F3F030E6A3F053F063F3F01464703312E300101494A4648036369643A6D6D6D2D6265657201014B4C3F10513F323F4F5A3F3F6B1F3F3F3F3F0101014D4F525303350101010101010D0A
UDH + WSP + content right file
Could you please tell me that can I download drc file by giving direct link (I do not care for 'Should' thing in OMA)
Actually I am not able to do that also.
In case of dr Handset is showing xml
and with drc it is showing 'file format not supported'