250 e-books compilation

Hello! I have a compilation containing 250 monetizing e-books + 1 for weight loss Tongue. I sell this compilation for 50$.
On another forum i received a review from a member:
Quality->8.5/10
Uniqness->7/10

So, for 250 e-books with that quality and uniqness i think 50$ will be a very good price.
Although, for the first 5 members who buy this compilation i will sell for 35$ ! After that it will cost 50$...

 

Could you please give proof that you have the rights to sell all of these guides?

 

And i can do that how?