ValidCharset - dniym/IllegalStack GitHub Wiki
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This is the currently set character set that IllegalStack compares sign and book text to, if you have book/sign protections enabled. Any character that is NOT part of this charset is considered illegal and helps find exploited books and signs. If you need to change this value a list of valid character sets can be found here: https://docs.oracle.com/javase/7/docs/technotes/guides/intl/encoding.doc.html
- To change the selected character set /istack value set ValidCharset (new charset)