9.1. Permission-based Security inside the Java 2 Platform
Permission-based security is used to make access control decisions. Given a piece of code, the security mechanism ensures that it is authorized to do what it wants to do. Let's review the entities and process involved in reaching such a decision. For a complete treatment of the subject, consult Inside Java™ 2 Platform Security [24].
9.1.1. Code Source
In the Java runtime environment, the object that is under security scrutiny is an instance of a class, with security-related characteristics that are encapsulated by its code source. The code source identifies the following two aspects of a class:
The origin of the class. This is represented by a URL that points to where the class was loaded. ...
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