Start with what the GPL actually prohibits. It does not prohibit keeping source
return ok(content);
，详情可参考新收录的资料
They also need to test the technology to bring the material back to Earth.，这一点在新收录的资料中也有详细论述
That means that about 11% of the validation regexes used in websites would, if used on the back end too, and using the stricter semantics where the regex must match the entire string let through the most basic XSS attack imaginable. This shouldn't be entirely surprising; front-end validation is meant to help the user, not to implement security features.
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