Will PDF-Writer enable me to insert, extract, change or remove invisible binary to a PDF document?
Which library you are using? There are many PDF writer libraries for different platforms and they provide features like insert text, extract text or images etc.
Please visit this page to get more information about such open source libraries.
I have not started the work on PDF yet. I prefer C++. I believe the Adobe open source library is C++ and using that library would probably be safer regarding compatibility. Will you be willing to give me a hand when the time comes to start on PDF?
Thanks for sharing your plan. I will help you as much as possible.