DoS 方面还有很多工作要做，但我先把目前手上的东西快速构建一版以防万一，然后再去琢磨更复杂的想法。这一版的版本号是 0.3.19。
There's more work to do on DoS, but I'm doing a quick build of what I have so far in case it's needed, before venturing into more complex ideas. The build for this is version 0.3.19.
正如 Gavin 和我之前明确说过的，这个软件对 DoS 攻击毫无抵抗力。这是其中一项改进，但仍有数不清的攻击途径。
As Gavin and I have said clearly before, the software is not at all resistant to DoS attack. This is one improvement, but there are still more ways to attack than I can count.
我暂时保留了 -limitfreerelay 开关，有需要时可以使用。
I'm leaving the -limitfreerelay part as a switch for now and it's there if you need it.
「安全模式」警报是 0.3.9 溢出漏洞之后的一项临时措施。我们尽管可以说用户运行时加 "-disablesafemode" 就行，但从外界观感来看，最好还是干脆去掉它。它从来就不是一项长期特性。看到一条更长（累计工作量更大）的无效区块链时，安全模式仍会触发。
"safe mode" alerts was a temporary measure after the 0.3.9 overflow bug. We can say all we want that users can just run with "-disablesafemode", but it's better just not to have it for the sake of appearances. It was never intended as a long term feature. Safe mode can still be triggered by seeing a longer (greater total PoW) invalid block chain.
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