This goes beyond DRM media offerings. This covers any cloud provided service.
An example is a client where a "knowledgeable" family member keeps pushing on-line backup as the ultimate solution, even claiming that other backups are no longer needed. Not that I would disagree with an automatic off-site backup, but you must allow for the company to go belly up.
In my research for them, I found that DataDepositBox.com is popular. However, from my communications with the company, it is clear that their admins are capable of changing your password and getting access to your key. I am not saying they are not a reputable service, nor that their staff are morally challenged. I am just stating the fact is that the company has the ability to access your data and they even claim they will provide your data to any government agency that properly requests it. Also, you will never have access to your encryption key, other than through them.
According to their terms of service, they only need to post information on their website prior to any discontinuation of service.
The key take away is that you must encrypt your data before you send it and there is always a chance they will not be there to provide your key to you when you may need them most. I am trying to explain this to my client, but they just bobble head what their family member told them. They seem to wish to ignore my recommendation of using an off-site backup along with a on-site tape or disk backup. The cloud is cool and slick, but you have to understand the limitations.,
The DRM issue is far worst for, from the outset, you are forced into a data lost potential you can never extricate yourself from. With all other cloud services, you have control of the data at some point. If, you lose anything, it is your fault. DRM just screws you over and you just await the ticking bomb to go off.