It became immediately obvious when Wikileaks hit the news by releasing classified information that security had suddenly become a broader issue. While security had broadened in recent years to include such correspondence as email, we are now facing a much bigger step. All internal documents and correspondence, memos, papers, etc.
The new broader security is now being addressed by companies and security consultants are busy devising ways to combat the efforts of Wikileaks imitators.
One of the prime security methods appears to be that old standby - monitoring. Monitoring of the handling of documents and monitoring of downloads to spot excessive accumulation of information. It won't be long until standard security procedures and packages cover this important element. For some additional information, check this article.