To be honest, this method wasn't very proper. Although it was logical to keep notes and to write down things so that you didn't forget, most techniques were not passed along, so much as simply inherited or taught. Di Tou didn't own the 'rights' to distribution of the technique so to speak, he only had the right to consult it and use it, and even then he only got it for the hour!
Still, seeing how often Di Tou's Spatial Rings got wiped out, it could be considered a rather secure storage!
And arguably, this time he had just been offered a technique with no other conditions to it. There was no request for a favor, nor did Old Gao say anything in peculiar. Normally, all the rules and stipulations about a technique or any other style from a sect would be clearly laid out ahead of time, so both parties knew what they were getting into and wouldn't accidentally cause trouble for one another, or create an enemy out of thin air.
So technically… Di Tou hadn't been told not to spread it!
