Recommendations for piracy protection for NSFW VR project?

I am helping to make an Adult Erotic VR experience (for the Rift) in Unity and as an adult experience it can not be sold on Oculus Home or Steam. I would be most grateful if anyone has any recommendations of companies offering solutions for any or all of the following :

• Piracy Protection
• Download servers
• Payments

So far we have found ImagineVR provides all three but we would like to see if there are any competing services for one or all of the above parts.

Many thanks