How I protect edition in some pages of my PDF, but accept modify one page in my PDF file?

For example...

I am author of a e-book. But, I want people distribute that my e-book inserting in first page your website of who is distributing.

Look at how I want stay it...




----------------------


Header
"You have downloaded this eBook by"

Name of distributor here.


(only that page can be changed)

Page 1

---------------------------------------------------------

Content my e-book

Page 2 (BLOCKED FOR CHANGED)


---------------------------------------------------------

Content my e-book

(BLOCKED FOR CHANGED)

Page 3

---------------------------------------------------------

Content my e-book

(BLOCKED FOR CHANGED)

Page 4




... ALL THE REST IS BLOCKED FOR EDIT.



I want that, How can I get it?

Please, apologize my bad english, I speak portuguese.