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If use the secret script in PDF file, you must set up a certificate in 256-bit AES to protect the script not to be easily viewed.
more, save the pdf file in PDF-1.7 format, very few third-party PDF reader can open it^_^
In short, we have done all the work is temporary protection.
I my school age, I had modified the ACROBAT reader to support the modified PDF file^_^
You can use winlicense&VMP&many others tools to protect this reader.
This is a rogue skills but really effective, hehe
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