export declare enum UsagePolicyType {
    UnrestrictedPolicy = 0,
    NumberUsagesRestricted = 1,
    TimerangeRestricted = 2
}
export declare abstract class UsagePolicy {
    type: UsagePolicyType;
    constructor(type: UsagePolicyType);
}
export declare class UnrestrictedPolicy extends UsagePolicy {
    constructor();
}
export declare class NumberUsagesRestricted extends UsagePolicy {
    usageTimes: number;
    constructor(usageTimes: number);
}
export declare class TimerangeRestricted extends UsagePolicy {
    startTime: Date;
    endTime: Date;
    constructor(startTime: Date, endTime: Date);
}