@yass22er22 :
You not totally understand the ".mc4" i think.
They can be easily decrypted. ".MC4" is really not a new format.
More difficult than the ".shn" to decryp(The old one are the cheat section encrypted), of course but it's feasible
In the past, DeathRGH offered me the same thing with the same arguments concerning the encryption of "SHN" files(The old one)
But when I'm going to check all that by myself, they don't hold a day and I find the solution to decrypt it.
It's the same thing with the "MC4" files so i'm not interested.