Lizard Safeguard PDF Security does not have a free version but does offer a free trial. Lizard Safeguard PDF Security paid version starts at US$500.00/month.
PDF DRM that does work
If you are looking to protect your PDF files and need a secure yet simple to use solution then LockLizard is the clear winner. A good solid product backed up by a responsive support team.
Good range of DRM controls
Unobtrusive to users
Easy to implement
Good and responsive technical support
Could support forms