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Generic DRM Wrapper for COTS: Client Architecture. Packaged content file. 0) Client receives the packaged content file. Metadata. Content. Digital Content Launcher. 1) Extract meta data from packaged file. 2) Parsing the rights information. 3) Decrypt the encrypted content.

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Generic drm wrapper for cots client architecture
Generic DRM Wrapper for COTS: Client Architecture

Packaged content file

0) Client receives the

packaged content file

Metadata

Content

Digital Content Launcher

1) Extract meta data

from packaged file

2) Parsing the rights information

3) Decrypt the encrypted content

Generic DRM Wrapper

4) Setup the restriction in generic

wrapper

Acrobat

Reader

IE

DjVu plugin

5) Launch the corresponding

player/reader with content.


Wrapping technique
Wrapping Technique

  • Using Detours to wrap win32 system call.

  • The wrapped system call can be controlled by rights information.

My_Systemcall_Print()

{

if Rights is not restricted then

Real_Systemcall_Print()

}


Wrapping technique1
Wrapping Technique

  • Keyboard Hooking.

    • PrintScreen

    • Ctrl + C

    • Ctrl + V

    • Ctrl + S

    • .....


Rights and win32 api mapping
Rights and Win32 API mapping

Win32 API

Rights

CreateFile,

WriteFile,

CreateDialog,

StartPage,

CreateProcess,

CreateThhread,

RegQueryInfoKey,

RegSetValueEx,

...

Print,allow, 5

Save, denial,

Copy, denial,

Play, allow, ∞

Read, allow, ∞

...

Rights and Win32 API mapping is the essential part of Rights Enforcement


Rights and win32 api mapping1
Rights and Win32 API mapping

It's hard to determine which CreateFile event is coming from Save behavior !!!!


Rights and win32 api mapping2
Rights and Win32 API mapping

  • The granularity of restriction is directly supported by Win32 API.

  • For example: Copy/Past behavior

    • There are many types of data can be copyed into the clipboard.

      • Text, Bitmap, Rich Text Format, WAV, TIFF, ....

    • Not only allow or denial Copy/Past, it can be extended.

      • Copy Text, allow, 5 times; copy bitmap, denial.

Copy/Past { types of data } {allow{times} /denial}


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