Hi gurus,
I'm a private trainer for college level math exam preparation. I use pdf file extensively. I've written several ebooks and run my own exam preparation online classes. My ebooks are sold through a third party as an instant pdf file download. After a customer's credit card payment goes through, he immediately download the pdf file. In addition, I run my own math online classes to paid customers. All the online class notes (homework assignments, solutions, and practice exams) are posted as pdf files in my online class website for authenticated customers.
Here is my headache. From time to time, some customers try to sell my ebook or my online class pdf files (homework assignments, solutions, practice exams) at ebay. I have to work through ebay to stop them.
Is there any way to have a sever dynamically generate customer header/footer to my ebooks and online class notes? For example, if John Smith buys my ebook, each page of the book will have a footer saying "This book is exclusively for John Smith@hotmail.com"? If John also takes my online class, when he downloads class note pdf files, the footer of each page of the pdf document will say "This document is exclusively for John Smith@hotmail.com"? This will help deter people from selling my ebooks and class notes at ebay.
Can anyone tell me how to do it for both ASP and PHP? The 3rd party retailer selling my ebooks uses ASP (the IT staff here unfortunately doesn't know how to do it). My online class uses PHP. I know some PHP. If the code is simple, I can implement it myself.
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