PDF (Portable Document Format) is a document format created by Adobe.
Circumvent PDF "security" Edit
PDF documents can be set to disallow editing, printing and copying. But that's all it is. A setting. You can still do all of those things with PDF viewers/editors that don't respect that setting. This can be done in Ubuntu's default PDF viewer Evince and in Sumatra PDF version 0.5 or under.
- Sumatra PDF - Open source PDF viewer for Windows (smaller, faster and open source) - the 0.5 version can print PDFs that have disallowed printing