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Question
OMA DRM forward locked protection
Hi experts,
I am just starting to learn OMA DRM and I have a question about Forward Locked file.
My understanding of the flow to use a forward locked drm file is as follows.
1) Make a file to be forward locked by using drm tools, the output will be .dm extension and upload it to a webserver.
2) Use your PDA with OMA DRM engine installed.
3) Point your browser to download the file. The Web browser will download the file and encrypt it on-the-fly by using installed DRM engine with your device specific ID. The content is also locked to the device; so that it cannot be forward to other devices.
makes sense, right?
What if I don't have a OMA DRM engine installed? does that mean I can download the file from a fee-paying site without encrypting it and be able to upload it to my own server and let everyone else download it? I tried to download the file using my desktop (no oma drm installed), the downloaded file isn't encrypted, and I was able to upload it to my own server. I then tried downloading it using my PDAs and it worked.
So what is the whole purpose of forward locked protection?
thanks!
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by: DaveHowePosted on 2007-08-24 at 06:03:17ID: 19761714
Your understanding is the same as mine - as I understand it, the basic form of OMA DRM is forward-delivered to the client and relies on the delivering webserver to correctly authenticate the downloader.
However, if the sender wishes to, he can "push" the decryption key required via MMS, so that it goes to a specified device (which must then download the .dm file via http) and in situations like that, the .dm file is relatively worthless.
This more advanced form is rarely used though, as vendors have found security though obscurity (ie, people not knowing to download the .dm file via windows) keeps their sales high enough the additional hard work does not appear to have a sufficient ROI to impliment.