PDF Copy Protection

Hi, I've tried to put a PDF with a copy protection into an E-Learning. With a programme (NitroPro) I put on the read-only/write-protected mask. If I open it on my computer it works, if I put it into the Articulate E-Learning it is as if the mask is nonexistent. From there the text can be copied. How does it work to get the copy protection into the E-Learning?