Thank You Pepsi for your reply.
yes through other forum topics, I got to know that I can modify the code and anything I want, and this is really so great.
About selling the themes, for sure, I will not resell your themes and will never claim them as mine, I think this is clear.
And yes, all I want to know if I am able to make websites for others ( if they ask for ), else, I will make my own websites.
Thank you again for your reply, I will consider to buy developer license because your themese suit my plans.
have a nice day.