The "5.2 new" version introduced several structural changes that older versions couldn't handle:
To comply with Adobe's "Protected Mode" security, version 5.2 includes a "plug-in broker" that safely requests file access without compromising system security. serial+number+quite+imposing+plus+52+new
The keyword refers to the licensing and activation requirements for Quite Imposing Plus 5.2 , a high-performance Adobe Acrobat plug-in designed for professional PDF imposition and page management. The "5