Radaee PDF library (canSave property)

I am using Radaee PDF library in my project.
The canSave property of doc is set to false by default due to which I am unable to use any annotations features.
How can I set this property to true by default?

canSave proper return the actual status of the pdf file.
You can't modify it.
Reason's it could return false are:
- you're activating standard license (pro and premium are needed)
- the file is in a folder where the app has not writing privileges
- the file has not write/modify privileges itself.

I am opening the pdf document using IRandomAccessStream with read and write access.
Still canSave property is set false in doc.
What could be the reason for this?

I am using the library which i have downloaded from this site.
I don't know which license it has?

are you experiencing the issue in the demo project?
where your pdf files are located?

I've just double checked the demo project on a file located on the desktop: canSave correctly report the true value.
I was able to add annotations and save them on the original file.