This option allows you to encrypt portions of your code.
Because the encryption can not be undone, you will get this warning:
If you chose YES, the selected code will be encrypted and will result in lines like :
Only the compiler can decrypt and process these lines. There is no way you can change the $CRYPT lines back into source code !
So make a backup of your code before you use this option. Typically, it will only be used on finished projects.
If the encrypted code contains errors, you will get error messages pointing to the $CRYPT lines.