You can use
PDF Unlock Tool Software to unlock PDF files. With this software all restrictions like a copy, print, edit, comment, sign, etc. can be easily removed. The software does not have any limitation on the size of the PDF document, you can unlock PDF file of any size without any hassle. Visit at more info:
https://www.toolsground.com/pdf-unlock-tool/
To know the Complete working of the tool read these steps:
1- Download
PDF Unlock Tool Software
2- Browse the PDF file
3- View Restrictions & select destination location
4- Click the Unlock PDF button to begin the process
5- Lastly, check the Unlocked PDF file