Only if you own the rights to the booklet, or it is public domain material.
That said, you will have no way to prove delivery. The buyer gets the PDF, file a not received case, and you lose the money. At least you would still have the booklet though.
The easier you are to offend the easier you are to control.
We seem to be getting closer and closer to a situation where nobody is responsible for what they did but we are all responsible for what somebody else did. - Thomas Sowell
