derivative of abc and x is ∅ (intuitively, the match failed here)
Chaumian credentials are about forty years old and still work well, provided your Issuer is willing to bear the cost of running the blind signature protocol for each credential it issues — and that the Resource doesn’t mind verifying a signature for each “show”. Protocols like PrivacyPass implement this using protocols like blind RSA signatures, so presumably these operations cost isn’t prohibitive for real-world applications. However, PrivacyPass also includes some speed optimizations for cases where the Issuer and Resource are the same entity, and these make a big difference.1
，这一点在搜狗输入法下载中也有详细论述
3D打印行业的版权问题由来已久，只是一直没人出来捅破这层纸。过去，个人少量打印、不作商业用途，风险不大。。关于这个话题，电影提供了深入分析
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