"Don't Steal Mac OS X.kext, sometimes referred to as DSMOS or DSMOSX, is a file present in Intel-capable versions of the Mac OS X operating system which enforces a form of Digital Rights Management, preventing Mac OS X being installed on stock PCs. The name of the kext is a reference to the Mac OS X license conditions, which allow installation on one piece of Apple hardware only. According to Apple, anything else is stealing Mac OS X. The kext is located at /System/Library/Extensions on the volume containing the operating system. The extension contains a kernel function called page_transform() which performs AES decryption of "apple-protected" programs. A Mac OS X system which is missing this extension, or a system where the extension has determined it's not running on Apple hardware, will be missing this decryption capability, and as a result will not be able to run the Apple-restricted binaries Dock, Finder, loginwindow, SystemUIServer, mds, ATSServer, backupd, fontd, translate, or translated."
While troubleshooting a QE issue I was having with my GPU, I added several kexts and saw this next and removed it. Now Mac OS X hangs on boot and not sure if deleting the don't steal next caused it. I can't even boot in Single User mode