07-22-2009, 11:06 PM
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 Re: protected oma to mp3
About OMA files
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File extension OMA is used to identify audio files created through Sony OpenMG Music Format. OMA files are encrypted and conform to the Adaptive Transform Acoustic Coding (ATRAC) format, a proprietary audio compression designed and used by Sony. OMA extension is similar to OMG extension which was also developed by the same manufacturer. Files using this extension can be opened on operating system platforms including Windows, Mac, and Linux.
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OMA files can be protected through Digital rights management (DRM) by Sony (OMA files can be DRM-free). DRM provides limitation to the use of the product by devices with no copyright protection imposed.
Native Sony applications and devices can open and process OMA files. This includes the SonicStage whose later version was designed to remove the DRM protection on some files. However, license copies are excluded for such process preserving their copyrights.
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Since Sony has an interest in protecting the copyright on the music that it sells, the design of SonicStage is closely tied to a requirement that the program guard against copyright infractions. Sony music players have a write-only design. Somewhat similar to an Apple iPod , it is not generally possible to move tracks from the music player to the PC hard drive, and thereby from one music player to another. Some earlier models (such as some of the Net-MD line) could not even transfer voice recordings made by the user (with the player's microphone input) to their PC.
Copy restriction is provided not by any one feature, but by a group of design features and software limitations. The main features being:
The software strictly enforces Digital Rights Management through its use of OpenMG . Sonic Stage ties the DRM license of each track to the hardware of the computer from which it has been transferred. SonicStage will not allow transfer of tracks from the player to another computer. It is possible, however, to backup "My Library" and import it into another installation of Sonic Stage on a different computer.
Music files have to be "wrapped" by Sony software in order to be played on a Sony music player. Sony has not introduced drag and drop support for music files. Although it is possible to load files directly onto a Sony player without using SonicStage, it is not possible to play music files loaded this way. Neither is it possible in most cases to transfer music files back to a PC. (all versions prior to 3.4)
The program does not generally convert OMG/OMA files to MP3 or WAV .
The program only encrypts in omg format, not mp3. The program encrypts any audio files imported into it in omg format, including audio files that are not legally downloaded, or illegally copied music.
The program lacks a true import album feature for WAV and MP3 files. The program imports tracks as is. Imported files cannot be grouped into an album with artist, title and tracknumber fields assigned at the time of import. This has to be done before or after import.
When WAV tracks are imported, they remain linked to their wav source file and the track can only be edited for as long as the WAV source file remains on the computer. This makes it difficult to use
Sonic Stage to edit CDs that have been ripped with another program.
Because of these security features there are limitations when using the program in Windows XP. Only users with administrator accounts can transfer tracks from SonicStage to Sony's devices.
As of version 3.4, an intermediate update mostly for Hi-MD users, some of the above restrictions have been relaxed. SonicStage 3.4 allows tracks recorded via digital/analogue inputs on Hi-MD devices to be transferred back in WAV format. Also, files in Sony's proprietary ATRAC format can now be converted to WAV.
3.4 is also the first update to the program to come out after Sony appointed Tim Schaaff , former Apple Computer executive, as senior vice president of software development.
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