Masking layersIt is a little history. Firstly the Internet reflected, as the open system and in protection did not require by definition. Pages which intended for the certain circle of persons, for example, page of the manager of a site or the pages demanding authorization of the user (chats, forums) in due course have started to appear. When all realized, that some information is valuable, they have started to reflect on protection of the published information and preservation of copyrights to it. Protective measures should be accepted manually. Have started to think out any cunnings with use HTML, JavaScript and DOM, and also have invented report SSL, which uses Java-applets (to not confuse with JavaScript), or the organization of virtual IP-networks. On report SSL basically commercial resources (for example, the Internet-shops), but as we (including you) fans we shall use the every possible simple cunnings described below work.
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