Decrypt Fiels

The one who can do it please quote.. I had purchased a few .pdf and video files from a person. He has locked the files and is saying that for every machine he will charge me extra where as the deal was never so. My company will throw me out when they find this out. Can you help me? Any additional info if required kindly reply. After a little research I found a Resource Viewer one of the files show the below in the Mainfest <?xml version="1.0" encoding="UTF-8" standalone="yes"?> <assembly xmlns="urn:schemas-microsoft-com:[login to view URL]" manifestVersion="1.0"> <assemblyIdentity version="1.0.0.0" processorArchitecture="*" name="UACAwareApplication" type="win32"/> <trustInfo xmlns="urn:schemas-microsoft-com:[login to view URL]"> <security> <requestedPrivileges> <requestedExecutionLevel level="requireAdministrator"/> </requestedPrivileges> </security> </trustInfo> </assembly>