DLP Endpoint has a built-in feature that prevents clipboard data from being blocked between documents that a single Process ID (PID) manages.
 

Clipboard blocking prevents issues with the program because it might use clipboard functions internally to share data between its own modules, and for usability. Copying data between documents with a common PID is not considered a security threat.
 

For example, in Microsoft Word each document is a child window of the master PID. The user can copy and paste data between these windows even if a clipboard blocking rule is in place. Any tagging or classification data is applied to the new document because DLP Endpoint tracks data copied between documents.
 

Conversely, a program that spawns a new process for each open document, such as Microsoft Notepad, is blocked for all copy operations regardless of which document the data is pasted into.