Well, one of the master keys leaked about 15 years back. A researcher posted a paper back in 2003 or so that outlined a method of finding a master key that was likely used by the people who made the release. It was a fun time to be on the internet, the people came together and said, yeah fuck those corpos and everyone reposted the key to every form of social media possible. I knew someone with the key tattooed on their arm (as part of their piracy themed artwork, I used to have pictures)

Now, that particular master key was patched out with a compatibility breaking upgrade, specifically 2.1 of the standard, which was proven to be broken in 2012, but there was less coming together to share it the second time, or the third for 2.2 of the standard.

But yes, if you wanted to code your own, you easily could. Just don't share it or the sue happy corpos will come knocking.