What is the mechanism behind SD card's write-protection under MS Windows and how to deactivate it? [duplicate]

I have an SD card which I use in Canon EOS 700D camera. I cannot delete the files! I checked the basic things I know the operating system is using for this purpose:

1. The physical lock on the side of the SD card is not locked (it is shifted to the "upward" position).

2. The read-only attribute of the individual files was not set.

3. I notice that there is a read-only attribute set for directories - see this screenshot:

   When I turn it off, it gives an error "media is write protected":

   What is this "write protection", what mechanism is behind it, where it is driven from? I click "ignore" and finally can delete the files. However, eject (unmount) the SD card and mount it again, it is set again!

4. I run cmd as Administrator, and run diskpart in it, it says "Current Read-only State : Yes", but I can't seem to turn it off:

   Microsoft Windows [Version 10.0.19045.3693](c) Microsoft Corporation. All rights reserved.C:\WINDOWS\system32>diskpartMicrosoft DiskPart version 10.0.19041.3636Copyright (C) Microsoft Corporation.On computer: LAPTOP-SAAK4JMODISKPART> list disk  Disk ###  Status         Size     Free     Dyn  Gpt  --------  -------------  -------  -------  ---  ---  Disk 0    Online          953 GB      0 B        *  Disk 1    Online           59 GB  1024 KB  Disk 2    No Media           0 B      0 BDISKPART> select disk 1Disk 1 is now the selected disk.DISKPART> attributes diskCurrent Read-only State : YesRead-only  : NoBoot Disk  : NoPagefile Disk  : NoHibernation File Disk  : NoCrashdump Disk  : NoClustered Disk  : NoDISKPART> attributes disk clear readonlyDisk attributes cleared successfully.DISKPART> attributes diskCurrent Read-only State : YesRead-only  : NoBoot Disk  : NoPagefile Disk  : NoHibernation File Disk  : NoCrashdump Disk  : NoClustered Disk  : NoDISKPART>

   Why wasn't dispart able to set the Current Read-only State to No?

5. Further information from the diskpart on the volume, as suggested here, says that the volume's status is "healthy", and shows no read-only flag:

   DISKPART> list volume  Volume ###  Ltr  Label        Fs     Type        Size     Status     Info  ----------  ---  -----------  -----  ----------  -------  ---------  --------  Volume 0     C   WINDOWS      NTFS   Partition    120 GB  Healthy    Boot  Volume 1     D   DATA         NTFS   Partition    814 GB  Healthy    Pagefile  Volume 2         SYSTEM       FAT32  Partition    100 MB  Healthy    System  Volume 3         WINPE        FAT32  Partition    512 MB  Healthy    Hidden  Volume 4         Onekey       NTFS   Partition     18 GB  Healthy    Hidden  Volume 5         WinRE        NTFS   Partition   1024 MB  Healthy    Hidden  Volume 6     E   Nový svazek  exFAT  Removable     59 GB  Healthy  Volume 7     F                       Removable       0 B  No MediaDISKPART> select volume 6Volume 6 is the selected volume.DISKPART> detail volume  Disk ###  Status         Size     Free     Dyn  Gpt  --------  -------------  -------  -------  ---  ---* Disk 1    Online           59 GB  1024 KBRead-only              : NoHidden                 : NoNo Default Drive Letter: NoShadow Copy            : NoOffline                : NoBitLocker Encrypted    : NoInstallable            : YesVolume Capacity        :   59 GBVolume Free Space      : 2504 MB

6. The HKEY_LOCAL_MACHINE\System\CurrentControlSet\Control\StorageDevicePolicies registry key doesn't exist.

MAIN OVERALL QUESTION: I am totally confused why and how is this possible? What particular mechanism of the Windows operating system is doing this? Is it somewhere on the SD card filesystem (the card has exFAT filesystem)? Is it a standard mechanism of that particular filesystem? If not, why does Windows respect that?