Description  Claims  Drawing  Cited references 

US20070124480A1   [0003]  [0004] 
WO2009109628A1   [0005] 
US2011055021A1   [0006] 
US20113346488A1   [0008] 

meantime-non-consensual HTTP user tracking using caches   [0004] 
Flash Cookies and Privacy II: Now with HTML 5 and ETag Respawning   [0007]