Welcome to WebmasterWorld Guest from 22.214.171.124
The only thing you can do is keep a specific program (namely Adobes original Acrobat Reader) from presenting an active print button to the user. Other PDF viewers may or may not adhere to your wishes.
Most people use Adobe anyways, especially to the industry this PDF is going to. I wont fret over the rest of the viewers, just as long as the majority is blocked.
Pubcon Platinum Sponsor 2016