Is it ok to negotiate an author individually who sells EA on mql market about legal rights?
In other worlds, I want to ask each author about the price when I sell his EA for other people.
Is it against mql community guide line?
You mean white label ? (get ea_1 from author , repackage it and sell it as ea_2 ,with their permission) ?
if they are similar its not allowed to be sold in this market.
Outside of mql you can do whatever you want but at your own risk.
IV.7.The Seller shall not publish multiple copies of Products, which are based on the same idea and differ only in input parameter settings, symbols, and/or timeframes. Creation of similar Products having slightly changed descriptions and/or design shall be considered as spam and lead to the removal of all detected copies from the Market showcase, while the Seller shall be banned from all paid MQL5.com services.