Copy protecting PDF files

I know that complete copy protection of a PDFs is not possible--at least that is what I have read. But can someone tell me why this shouldn't work: I create my document in InDesign. The layer I want to protect (the data I sell) is the bottom layer. I then add a second "invisible" layer that is a "button" and put it on top.
In the trial version I set up, the button-layer, when clicked, takes me to a page I created that tells me that copying is not allowed. Seemed to work. But not being much of a PDF person, I am not sure how effective this is (read: how easy would it be for a person to get to the bottom (data) layer if they really tried.)
The reason for the security is that my document will be sold to subscribers as a PDF. Much of the data in it comes from sources who would not be too happy about their data going any further than the intended reciepent.
If I can get the copy problem solved (to a reasonable degree) I will need to get to work on finding out the best way to prevent (or at least make difficult) further distribution of the document!

I played around with watermarks a few days ago. And I still might incorporate them when the time comes. What my main problem is, is that the companies that provide me with the data that goes in to the final PDF needs to be as copy-proof as possible, otherwise they will stop selling me their data.
So I am trying to come up with a method that would really require subscribers to my magazine to go out of their way to have to copy the data (which are mostly tables made in Excel spreadsheets). My suppliers haven't minded (too much) that up to now I have have been publishing their info in our printed magazine. They know people can scan the data from there. They just don't want it to be made available in a format where it can be easily "stolen" and distribued further electronically. I pay them a lot for their data and I am not their only customer. If it gets too easy for people to take the data from me, they will loose  other customers.
I will keep trying different techniques.

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