I have some information in my database with legal data that is with CopyRight. I have seen that google books is using some "kind of system" that protects the content to copy and print.
For example this link
If you try to print it (CTRL+P) the book does not appears.
Could you please tell me how can I protect my web content in order to disable the print option as you can see in google books?
My platform is developed using ruby on rails.
Thank you very much for your help,
Google's technique is, not surprisingly, fairly sophisticated. They are not serving HTML or even PDF content. What you're viewing is images, and I'm guessing that they use something akin to the Google Maps techniques to scroll them, although I've never looked. But they load these images on the fly as you read through pages. You could easily take one of those images, say, the first page of the preface and print it. So those techniques will not only be difficult to duplicate, they will not actually prevent printing.