Anti tamper methods - .Net

[msaly]

Hi

I have a dll protected with "CryptoObfuscator".this is not a problem. my problem is an internal anti tamper method that protect dll from any change(unpacking,inline patching...). file have not SN protection. after any change [unpacked and patched], "dll" worked, but final result hat a graphical message error and watermark (tamper detected). code base is c#. i know some method to tamper detecting but non helped. can anybody give me more info or refrence about this protection work or functions maybe use.



some refrence (not helped):

https://www.c-sharpcorner.com/article/file-tampering-detection/

https://www.drdobbs.com/windows/making-net-assemblies-tamper-resistant/184405729?pgno=1