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你的比特是什么颜色？（2004）
What colour are your bits? (2004)
2013 — 2020，它一次次回到首页
黑点是上首页（≥ 50 分）的那次投稿，空心点是没冲上去的投稿，点越大分数越高。
导读
这篇 2004 年的经典文章提出了“比特的颜色”这一思想实验：在计算机看来所有比特都一样，但法律却关心这些比特的“来历”——比如一段数据是否源自受版权保护的作品。作者用独石碑（monolith）等例子探讨法律如何处理无法从数据本身看出的历史信息，并延伸到淫秽法等领域的类比。
为什么经久不衰：它用一个简洁的思想实验揭示了法律与计算机科学视角的根本错位，至今仍是讨论版权、加密与数字权利时绕不开的思维框架。
HN 评论精选
颜色即历史，法律基于历史追责在数字世界完全可行，问题只在于我们是否愿意。
“颜色”其实就是历史。比特和实物都可以有未记录在自身之中、却与法律相关的历史。比如法律在意你开的是不是赃车，尽管车的原子上没有标着“被盗”的 XML 标签。基于历史执行规则在物理和数字世界都很难，但并非不可能——在数字世界甚至可能更容易，因为有无处不在的监控和强大的内容识别算法。拿计算机科学来说事只是搪塞，就像被问如何追踪被盗汽车时，理论物理学家回答说质子不可区分。实践中历史是可以追踪的，唯一的问题是我们想不想。
cousin_it查看英文原文
"Colour" is just history. Both bits and physical things can have history that isn't recorded in the thing itself, but is relevant to the law. For example, the law cares if you're driving a stolen car, even though the car's atoms don't carry XML tags saying "stolen". Enforcing rules based on history is hard, both in the physical and digital world, but it's not impossible. It might even be easier in the digital world, due to ubiquitous surveillance and robust content ID algorithms. Pointing to computer science is just a deflection, like a theoretical physicist explaining that protons are indistinguishable when asked about tracking stolen cars. In practice, history can be tracked. The only question is whether we want to.
用加密/异或的例子说明：单独的数据不侵权，提供还原方法才构成侵权。
“颜色”把一个简单问题复杂化了。关键在于：有些比特描述了如何把随机数据还原成受版权保护的内容。设想你把受版权保护的资料加密后放到网上——没有密钥它毫无用处，不构成侵权；但如果你再公布解密密钥，任何人都能播放它，你就侵犯了版权。同理，从 /dev/random 取一段数据当然没有版权，与受版权作品异或后的结果也没有版权，单独发布哪个都不违法；但如果你告诉大家把这两个文件异或到一起，你就突然侵犯了版权，因为你让他人未经许可访问了受版权保护的作品。
syrrim查看英文原文
"Colour" overcomplicates what could be a simple issue. There are bits that describe how to turn it from random data into copyrighted material (eg sound, visuals). This is easy to see. Imagine you took some copyrighted material and encrypted it. Then you posted that online. Without the public key, the file would be useless, and you wouldn't be violating copyright. Now imagine you posted the decryption key. Now anyone can play the file, and you are infringing copyright. This can be easily applied to the monolith case. If you take a chunk of data out of /dev/random, then this of course is not copyrighted. If you xor it with some copyrighted work, the result is also not copyrighted. If you post either of those files online, you haven't broken any laws. If you post both online, you still haven't broken a law. If you tell everyone to go xor those two files together, then you have suddenly infringed the creators copyright, by allowing others unpermitted access to copyrighted works.
应从信息论和系统整体效果来看，而非纠结于比特本身的“颜色”。
我认为用信息论来思考比“比特的颜色”这个假设更好。如果我合法获得了一首受版权保护的歌曲，我分享副本的权利就受到限制。我可以用一次性密码本与歌曲异或，作者会说这些比特现在是“无色”的；但如果我把结果连同解密方法一起发给你，我实际上是在用一个机制传递完美副本。重要的不是密文是否“有色”，而是整个系统的净效果：我建立了一个完全合法的通信信道，却用它未经许可地分享了受版权保护的作品。
not2b查看英文原文
I think it would be better to think in terms of information theory, rather than the hypothetical color of bits. If I have a legally obtained copy of a copyrighted song (that is not permissively licensed), then I am restricted in my right to share copies. Certainly I can create a one-time pad and communicate that to someone, and I can XOR the bits of the song recording with that one-time pad, and the author would argue that I now have colorless bits. But I send it to you along with instructions for how to decrypt it, I'm using a mechanism to communicate a perfect copy. It isn't that the ciphertext is now "colored", it's that the net effect of my mechanism is that I've communicated the original song, with perfect fidelity. That's what matters: the net effect of the system as a whole. I will have created a communication channel (perfectly legal), and used that channel to share a copyrighted work without the creator's permission (not legal, depending on the details).
这篇文章是理解法律思维与程序员思维分歧的绝佳心智模型。
这篇文章非常有助理解为什么不用软件逻辑思考的人在这些问题上无法与程序员达成共识。我从未想过版权问题的微妙之处会绕回对淫秽法的看法，而这大概是这方面最优雅的解释了。我是第一次读，但怀疑它会成为我今后多年世界观建模的一部分。
jchw查看英文原文
This is actually very helpful to mentally understand why people who are not thinking with regards to the logic that software works at don’t see eye to eye on these issues. I would have never imagined something like nuance on copyright would somehow weave back around into opinion about obscenity law, and yet this is about as elegant as any explanation of it. This is my first time reading this, but I suspect it has become a new part of my mental modeling of the world for years to come.
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