Yea, so I found out the hard way that the I Ching (Book of Changes) is pretty much illegal so long as it doesn't fudge the truth and glorify communism.
If you do not know what the I Ching is I am surely not the one to tell you about it. It is far to vast and complex for me to begin with. Yet it is also called "The Simple Book." And indeed that it is. So, if it is meant for you to learn it, it will be, otherwise, no worries. I wish you only the very best!