1. What exactly is an Ebook?
2. Do I need any special software?
3. Do your ebooks work on Macs?
4. When will I receive my ebook?
5. How do I download and read your ebooks?
6. How do I open ZIP files?
7. What kind of payment methods do you accept?
8. Can I order from anywhere in the world?
9. What kind of guarantee do you offer?
10. How do I claim my refund if I'm not satisfied?
11. How are ebooks delivered?
12. How long does it take to download an ebook?
13. What does Private Label Rights mean?
14. What does Resale Rights mean?
15. What is Master Resale Rights?
16. What does Personal Use mean?

That can vary from writing an introduction paragraph or editing the title to completely modifying it any way you want and add your name to it as the creator (with or without the condition that you HAVE to modify the content).

Anything allowing you to change the content (except branding an affiliate link) is called Private Label Rights.

Private Label Rights does NOT automatically mean you also have obtained the copyrights. That's another issue, because copyrights are granted the moment a document, in whatever form, is finished.

Obtaining Private Label Rights does NOT automatically mean you also have obtained any other right like re-selling (Reprint) or even licensing others to reprint (Master reprint rights).