You do own your computing machine, which means you have the right not to use proprietary software. That doesn't mean that proprietary software itself isn't moral if the user chooses to run it. You seem to believe that any software which isn't free is also abusive, when that's clearly not the case. Many software companies that develop proprietary software are profitable and are so without abusing their users.
DCMA only "restricts your freedom" so far as someone else intellectual property is concerned. If that software had never been created there wouldn't be the "freedoms" surrounding it to restrict. It's also usually illegal to buy a painting and then sell prints of that painting so your freedom is likewise "restricted". While I agree that some parts of DCMA aren't ideal, the broad argument of proprietary software "restricting your freedom" because of it is fallacious.