Why can't I print this PDF? Why can't I copy text from this PDF?

If the PDF you receive is secured, then the author of the document may have applied security restrictions.

Or, perhaps, you've secured a file and want to remove security from it.

In this demonstration, Rick Borstein of Adobe answers these questions:

1. How do I check the security of a PDF?
2. How do I remove security from a PDF?

You can visit Rick's Blog which covers the legal applications of Adobe Acrobat.