Embedded Tacking Data in WMA Files?

[SubOrbital]

When I encode a WAV file to WMA with the Voice 9 codec set to 10 kbps, The file is slightly different every time. Examination with a hex file editor that there are three relativity short binary strings embedded in the file. All other bytes are an exact match as are the file lengths. (WinHex in compare mode.)

I'm concerned this is the codec embedding information about my system like the hard drive silicon serial number or the Windows product ID. Does anyone know why the files are different at these bytes every time? Anyone know of a WMA "snooper" program that will analyze the file and display all the deep technical details of the file that may shed light on the matter?

Seems to me that an audio output file should be exactly the same byte stream on successive runs like I see with MP3s.

[Spoon]

Re: Embedded Tacking Data in WMA Files?

Even ogg has an embedded serial number in the stream to unqiuely identify it, there is nothing sinister about ogg.

[SubOrbital]

Re: Embedded Tracking Data in WMA Files?

But "Microsoft" and "sinister" have been mentioned together more than a few times in the past, no?