How to use java protector to properly protect java code from decompilation? Best of all opensource free solutions.

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    the best defense is to write code so that no one can understand it even without protectors)) - Ep1demic
  • OK to protect the code ....... opensource solutions ........ qualitatively and for free? However, however ..))) - Alexey Shimansky

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Proguard In the same place alternative variants and their small comparison.

UPD: But, you need to understand that no obfuscator will protect your code by 100%. It only can complicate the process of decompiling and increase the time spent on it.