Protecting .pdf files - Adobe Acrobat

To prevent users form copying content of your .pdf file and printing it follow these steps:

1. Open your document with Adobe Acrobat
2. Go to File/Properties/Security tab
3. Choose Password security form Security method

It seems to me that this name of security method is a bit misleading. At first I was traversing this option because it looked like something I wasn't looking for. But it is as it is so just go for it.

Now choose your options as you wish: Compatibility, Components to encrypt and Permissions.

Optionally you can add document open password. Save your document to apply your options.

For additional info on this options http://help.adobe.com/en_US/acrobat/pro/using/WS58a04a822e3e50102bd615109794195ff-7d77.w.html