Preventing copying pdf file

hello,

 

i created pdf school book students.

the students buy book on site.

the student can enter answers homework in book , send them teacher.

 

on first page enters:

- teachers email

- teachers name

- students email

- students name

and saves pdf

 

with thees fields book knows send answers

 

the teacher can send grade.

all works fdf files.

 

i need prevent students copy book , not buy it?

 

what way this?

 

 

thank you.

dan

there absolutely no way.

 

you can consider drm (digital rights management) out of budget. drm not stop file being copied, makes copy useless.

 

probably best solution consider server solution stamp student's name book. won't stop of them.

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