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Message: [QUOTE="John C. Bollinger, post: 653267"] No, not entirely. Perhaps you do not realize that Adam's suggestion of a "sealed" jar file was a variant on existing technical terminology. The Jar specification supports a feature called "package sealing", which permits a jar creator to indicate to the VM that the only classes that are permitted to be in a specified package are the ones contained in a particular jar. As I recall, this is backed up by a digital signature so that new or modified classes cannot be inserted. You will note the broad similarities between this feature and your suggested scheme. [/QUOTE]