Hi Hannes,
Some files may really not work after protection and that's ok since they contain internal validation mechanism that prevents the file from being changed.
You can send us non protected file at [email protected] and we will check if and how it can be protected.
Protected File doesn't work after registration
Re: Protected File doesn't work after registration
Thank you for the file, please check email, we have sent a solution to you.
Re: Protected File doesn't work after registration
Hello, you find solutions that could be useful to others before asking a question, it is a pity that we cannot take advantage of its solutions.
Re: Protected File doesn't work after registration
what is the solution? 
Re: Protected File doesn't work after registration
Please contant [email protected] we will try to help.
