[kgwgk]

If something was a copyright violation yesterday, it will still be a copyright violation tomorrow. And vice versa.

If you fear that arXiv will implement filters that will recognize that what you are uploading is a translation of an obscure Prussian research paper and block the upload, I don't think that's going to happen. (But I will be really impressed if it happens!)

[isthatart]

But what if it is not a copyright violation but it looks like one to some dumb filter? For say 0.5 million articles from arXiv?

[kgwgk]

Then the dumb filter (if one is put in place at all) will be tuned to be less dumb, I guess.