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2004-07-13 Wei-Neng Hung 1/ Digital Content Launcher Generic DRM Wrapper for COTS: Client Architecture Generic DRM Wrapper Acrobat Reader IE DjVu plugin.

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Presentation on theme: "2004-07-13 Wei-Neng Hung 1/ Digital Content Launcher Generic DRM Wrapper for COTS: Client Architecture Generic DRM Wrapper Acrobat Reader IE DjVu plugin."— Presentation transcript:

1 Wei-Neng Hung 1/ Digital Content Launcher Generic DRM Wrapper for COTS: Client Architecture Generic DRM Wrapper Acrobat Reader IE DjVu plugin MetadataContent 1) Extract meta data from packaged file 2) Parsing the rights information 3) Decrypt the encrypted content 4) Setup the restriction in generic wrapper 5) Launch the corresponding player/reader with content. Packaged content file 0) Client receives the packaged content file

2 Wei-Neng Hung 2/ 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() }

3 Wei-Neng Hung 3/ Wrapping Technique Keyboard Hooking. –PrintScreen –Ctrl + C –Ctrl + V –Ctrl + S –.....

4 Wei-Neng Hung 4/ Rights and Win32 API mapping Rights and Win32 API mapping is the essential part of Rights Enforcement Right s Win32 API Print,allow, 5 Save, denial, Copy, denial, Play, allow, Read, allow,... CreateFile, WriteFile, CreateDialog, StartPage, CreateProcess, CreateThhread, RegQueryInfoKey, RegSetValueEx,...

5 Wei-Neng Hung 5/ Rights and Win32 API mapping It's hard to determine which CreateFile event is coming from Save behavior !!!!

6 Wei-Neng Hung 6/ 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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