Abstract: A security sticker and a document retrieval system therefor is described, wherein the sticker comprises one or more security features on a backing layer having opposite first and second major sides, said first major side having a transparent or translucent adhesive layer applied at least to a first part thereof and a liner on aside of the adhesive layer remote from said backing layer. The first major side has in the first part of said security sticker a first area containing one or more indicia describing first information to be displayed and to be protected against forgery and/or tampering in a first mode of use and said second major side has in a second part of said security sticker a second area located opposite to a third area on said first major side that does not contain information to be displayed and protected in said first mode of use.