I don't know if it is a question to be asked here, but there is: I'm writting a ebook and I'm gonna to sell it soon.

I'd sell it at Google Play Store, but here in Brazil they don't accept PayPal as payment (and many brazilian don't have a credit card), so I think that the best option is to sell it by myself.

I could sell it also at Amazon, but the Kindle format just sucks when you work with (a lot of) equations.

But, of course, there's a problem about sending the pdf file to the buyer. My friend suggested me to lock it with a serial key - like a software. Then a person could open it just in one or three computers. I know there's a package that lock the pdf file with a password (that I create), but I'd like to have a way that block this password when it's used a lot of times - really like a software.

Is it possible?

Do you have any other ideas to protect a pdf file?

I'm gonna take the copyright of my ebook here in Brazil and I know that I can't protect it totally, but I'm trying to do everything I can do to protect it.

There's also a brazilian site (www.hotmart.com.br) where you can publish anything you want and they say that, about pdf files, they print in each page the document number of that one who bought my ebook.

Thanks! :)

closed as off-topic by Werner, Andrew Swann, Jesse, LaRiFaRi, Masroor Jun 23 '14 at 7:42

This question appears to be off-topic. The users who voted to close gave this specific reason:

  • "This question does not fall within the scope of TeX, LaTeX or related typesetting systems as defined in the help center." – Werner, Andrew Swann, Jesse, LaRiFaRi, Masroor
If this question can be reworded to fit the rules in the help center, please edit the question.

  • We do not put an explicit thanks in the question or answer, you can think other people by using upvotes. – Masroor Jun 23 '14 at 4:34
  • It's just a part of my education. And I upvote when I it's worth for me. – mvfs314 Jun 23 '14 at 4:37
  • @Masroor Think other people? Do you mean thank? – Przemysław Scherwentke Jun 23 '14 at 4:39
  • 9
    This has nothing to do with LaTeX... voting to close. – Werner Jun 23 '14 at 7:01
  • 2
    @mvfs, it's not quite square on, but take a look at security.stackexchange.com. There are some questions about securing PDFs. Base your question on what's there already and it will be less likely to get closed. Good luck, – alexis Jun 24 '14 at 11:24

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