Is there a way to restrict a recipient from emailing said pdf to anyone else once it's been purchased and downloaded. Of course, a password would be required to open the pdf and any editing or printing, etc would be restricted as well.
Anybody know if this is possible?
You can't prevent people from emailing a file, but you can prevent a file from being opened. Acrobat supports various forms of security (Password, Certificate, LiveCycle Rights Management), each with advantages/disadvantages.