It's neither illegal, immoral, or unwise to own the Clinician's manual or Evaluation Software for your particular OSA machine. If you want it and are persistent, you can get it.
The clinician's menu for the ResMed machines can be discovered by anyone with the normal amount of curiousity. There are only 11 multikey combinations excluding the "Start" and "Power Plug". You can try all 11 combinations in less than 45 seconds and discover the Clinicians Menu entirely by trial and error.
For the Respironics, it takes a little longer. A bright high-school student can figure out how to access that menu in less than five minutes. Shame on us for not being more inquisitive!