You can log onto the server with admin rights, but still open the QV document with reduced rights. The rights inside the QV document are determined by section access (typically in the hidden script!) and are unrelated to your AD admin rights.
You have reduced rights due to section access.
But... you can delete the hidden script file
1.-First save all sheet codes in the script as main.qvs, or calendar.qvs etc...
2.-Create a -prj folder and deleting the hidden script xml file, it will be in a binary.data file .
Otherwise you will only save layout.
3.- You will need to create a new script and copy the contents of the qvs files but once it's removed you will have the option to create a new hidden script.
Check this video, it may be helpful: look for "qlikview remove hidden script password" in Google.