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Domain Perimeter

Macromedia observes a security principle sometimes known as an origin check or domain perimeter. In this case, the principle forbids ActionScript from loading XML data from third parties. More precisely, it inhibits a Flash program from downloading data from any URL that is not within the subdomain from which the Flash program itself was loaded. The subdomain is what we usually think of as an organization's domain name. In the case of a top-level domain (the TLDs are .com, .net, .org, .edu, .gov, .mil), a subdomain has two parts separated by a dot. The first part is the name and the second is the TLD itself:

  • alw.com

  • acobson.net

  • aspca.org


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