当文件受到保护时，使用者仅能进行有限变更，例如只能加入附注、进行修订或是完成表单。
When a document is protected, users can make only limited changes, such as adding annotations, making revisions, or completing a form.
例如，附注可能包含工作流程可以从此追踪点取得的潜在执行路径的资讯，或可能包含要在使用者介面中显示的资讯。
For example, an annotation could contain information about the possible execution path the workflow can take from this track point, or it could contain information to be displayed in a user interface.
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