Abstract: A computer-implemented method is provided, including storing, in an authentication server system, a URL identifying at least one web page, and providing a secure zone browser-side script to be placed on the web page. Upon opening of the web page in a browser, the secure zone browser-side script triggers execution of a server-side script at the authentication server system. The server-side script creates, on the web page, an inline frame, which is controlled by the authentication server system during a session that is associated with the inline frame. The authentication server system retrieves a referrer address from the session, and compares the referrer address with the stored URL. Upon finding a match between the referrer address and the stored URL, the authentication server system delivers web content to or via the inline frame. Other embodiments are also described.

Abstract: A computer-implemented method is provided, including storing, in an authentication server system, unique identification codes assigned to respective entities. Secure zone HTML code elements are provided for placement on a web page in association with respective identifiers of the entities, the HTML code elements specifying (a) respective ones of the codes for the respective associated identifiers of the entities, and (b) creation of respective inline frames on the page. Upon opening of the page, execution of a server-side program is triggered at the system, which program receives the codes specified by the code elements. The received codes are authenticated by comparing the received codes to the codes stored in the system. For each match found between one of the received codes and one of the stored codes, the system delivers web content to or via the one of the inline frames associated with the one of the received codes.

Abstract: There is provided a method that includes storing a plurality of image elements of a seal media object in respective files in an authentication server system, each of the image elements is selected from the group consisting of: a layer of the seal media object, a still image portion of the seal media object, and a moving image portion of the seal media object. Authenticating at least a portion of a web page, upon opening of the web page in a browser, by the authentication server system. Delivering to the browser, by the authentication server system, files for assembly and display of the image elements on the web page as the seal media object upon authenticating.