Re: [linux-minidisc] Sonicstage will only convert select uploaded files to wav

[Michael Karcher <Michael.Karcher@fu-berlin.de>]

Am Dienstag, den 16.03.2010, 18:17 +0100 schrieb Jan Olav Stangeland:
> after uploading unprotected Hi-LP and Hi-SP tracks (Atrac3plus) with
> MZ-RH1 and importing them into SonicStage, some of the tracks are marked
> by SonicStage as nontransferable. The tracks marked as nontransferable
> play just fine, but cannot be converted to wav.

I found the cause of these issues: Our upload program kept the "Content
ID" from the track on the Hi-MD, but did not send any DRM information to
Sonic Stage. The content ID is used to associate DRM metadata (and the
encryption key in case of encrypted tracks) to the .OMA file. If the DRM
metadata is not found, Sonic Stage is able to play this file, but will
forbid all conversions and transfers. The latest source commit makes
QHiMDTransfer create .OMA files with a content ID of zero, and Sonic
Stage does not apply any restrictions to that kind of file. I expect
binaries to be available soon, too.

To remove restrictions of files you already uploaded, clear the content
ID by overwriting bytes 12 to 31 (0C..1F) with zeroes. But BE CAREFUL:
If you clear the content ID in an encrypted .OMA file, the file gets
*useless*, as the encryption key is no longer connected to the .OMA
file, and you will have a lot of fun trying all content IDs you system
has encryption keys for until the track works again.

Regards,
  Michael Karcher