1. Any payments are discretionary, non-binding and revocable for future years. 所有支付均为酌情支付，无附加条件且将来几年可撤销。
2. Based on the scheme in [3], a revocable asymmetric traitor-tracing scheme is proposed, which is more suitable to pratical use. 在文献[3]的基础上提出一种可动态撤销的非对称叛逆者追踪方案，使之能更好地适用于广播传输中。
3. When you establish a revocable living trust, you are allowed to be the trustor, the trustee, and the beneficiary of that trust. 如果你设立的是可撤回生前信托，你本人可以是委托人，被委托人，和受益人。
