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8.0

OMA DRM forward locked protection

Asked by fungi8210 in C++ Programming Language, Encryption for Network Security, Windows MobileProgramming

Tags: drm, oma, forward, lock

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!
[+][-]08/24/07 06:03 AM, ID: 19761714Accepted Solution

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About this solution

Zones: C++ Programming Language, Encryption for Network Security, Windows MobileProgramming
Tags: drm, oma, forward, lock
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Solution Provided By: DaveHowe
Participating Experts: 1
Solution Grade: A
 
[+][-]03/10/09 06:31 AM, ID: 23846392Administrative Comment

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