Full Guide to Unlock Your Vivo X100 Pro

Full Guide to Unlock Your Vivo X100 Pro

Peter Lv13
https://techidaily.com ## Full Guide to Unlock Your Vivo X100 Pro

Yesterday my kid was using YouTube on my Vivo X100 Pro to help solve an assignment. However, it wouldn’t take the Vivo X100 Pro pattern unlock when I tried opening the phone. Maybe the kid has accidentally changed the lock, but I don’t know what to do. Please help me.

This article is for you if you have been locked out of your Vivo phone. Many individuals fail to remember their password or change it accidentally. However, it is not a big deal now. We’ll talk about the best Vivo X100 Pro password unlock tool today.

There are multiple ways to unlock your locked Vivo device. All the solutions mentioned here are effective and work 99% of the time. However, we suggest you use Dr.Fone. Dr.Fone is expert software to answer all your Android needs. It is safe, secure, and free of data loss.

Part 1: 3 Easy Ways to Remove Your Vivo X100 Pro Lock

### 1\. Google Find My Device

Google Find My Device is an inbuilt feature in Vivo phones to unlock your phone through Google accounts. You can utilize it to unlock the Vivo screen lock. However, you need to know that you will lose all your files on the Vivo phone after the Vivo X100 Pro password unlocks. Therefore, make sure to back up your data before proceeding with the following steps:

  • Ensure your locked Vivo phone is connected to your Google account and WiFi/Data. Then open the Find My Device site on a PC, and sign in with your phone’s Google account.
  • Kindly select your device, and tap the “Erase Device” option.
  • Type your Google account credentials once more. Then, click the “Erase” symbol to begin the unlocking system. That will remove the pattern lock from your OPPO, and you can open it without effort.

google find my device

### 2\. Answer Security Questions

This method is for you if you have set security questions while making your Google ID. By addressing those questions, you can unlock the Vivo X100 Pro screen lock. In any case, this way is invalid on some old Android phones.

To unlock this way, you need to press the Forgot Password option. If you can’t see the “Forgot Pattern/Password button on your phone, follow these steps:

  • Try unlocking your Vivo smartphone with some wrong patterns a few times. Then you will see the “Forgot Pattern” symbol on the screen and tap it.
  • Select the “Answer question” option to get to your security questions. Then, at that point, answer each of them correctly.

answer question

https://techidaily.com - It will automatically unlock your device if you answer all questions accurately. Then, it will expect you to set another screen lock for your OPPO. Therefore, keep the new PIN to yourself. https://techidaily.com ### 3\. Hard Reset

If you wouldn’t worry about losing your user data, you can attempt this unlock method for your Vivo X100 Pro. You won’t require any account or applications. It requires you to have sufficient battery life. It is simple. So let’s see how it is done.

  • Check whether the battery percentage is over half. Then power off your Vivo phone by holding the “Side/Power” key for around 10 seconds.
  • Press and hold the “Volume Down” and “Side/Power” buttons till the Vivo logo appears on display. Then, at that point, your phone is in recovery mode.
  • Utilize the volume keys to pick the “Wipe Data/Factory Reset” choice, and press the “Side/Power” button to select it. Then, at that point, pick “Yes” to go on. You can reboot your Vivo after the reset is finished, and the lock will be no more.

wipe data

https://techidaily.com https://techidaily.com ## Part 2: The Efficient Tool for Your Vivo X100 Pro Unlock

Dr.Fone - Screen Unlock (Android) offers a wonderful tool that works to unlock Vivo devices rapidly. This lock screen remover tool can unlock your phone from every five locks: PIN, passcode, face lock, pattern, or fingerprint in only a couple of basic steps. It works with all the Vivo models hassle-free. So, download it right away for a safe unlocking experience. Here’s how you can use it:

Step 1. Start your hard reset from Dr.Fone

Make your Vivo X100 Pro phone connected to the PC through a USB cable. Then, at that point, click “Screen Unlock” > “Android” on the program.

Step 2. Select Unlock Android Screen

When you arrive at this page, please choose the button “Unlock Android Screen”.

unlock android

Step 3. Select device brand

We’ll offer you a phone brands list, almost all Android devices are here, for example, Samsung, Huawei, OPPO, Vivo, Lenovo, LG, etc. Then Select Vivo to continue.

download mode

Step 4. Unlock your Vivo X100 Pro now

The following steps are the key to unlocking your Vivo device. Attention! The unlock process will also wipe your data!

Great! Now the unlocking progress is done, and you can use your phone without entering password.

remove now

https://techidaily.com https://techidaily.com ## Bonus Tips: The Importance of Backing Up Your Android Data Regularly

The data loss on your Android phone or tablet can be extremely unpleasant. Subsequently, it’s suggested that you back up your Android phone or tablet consistently. It will keep you from losing your data. As an expert application, Dr.Fone Backup and Restore (Android) can help back up a wide range of data and settings on Android. In the meantime, it lets you review and restore the backup documents to another phone. Here’s how:

  • Open the Dr.Fone software on your computer, and connect your phone to the PC through a USB connector and click OK. Then select the “Back up device” option.

phone backup

  • Tap the Backup option to begin the process.

connect oppo

  • The process will require some time.
  • After it is done, you can see where the backup is stored by clicking on the “View BackupS” option.

backup complete

https://techidaily.com

Conclusion

All the best Vivo X100 Pro password unlock tools are displayed above. They are helpful, dependable and safe to use. However, if you need the easiest tools, you must pick the Android Screen Unlock program. In this case, the Dr.Fone - Screen Unlock (Android) can unlock your Vivo phone without any issue. Therefore, we strongly suggest you use Dr.Fone for backup and unlock your device.

Top 10 Password Cracking Tools For Vivo X100 Pro

https://techidaily.com ## **What is password cracking?**

Password cracking process involves recovering a password from storage locations or from data, transmitted by a computer system on network. Password cracking term refers to group of techniques used to get password from a data system.

Purpose and reason of password cracking includes gaining an unauthorized access to a computer system or it can be recovery of forgotten password. There might be another reason of using password cracking technique that is for testing password strength so hacker could not hack into system.

Password cracking is normally performed thought repetitive process in which computer applies different combinations of password till the exact match.

Brute Force Password Cracking:

Term brute force password cracking may also be referred as brute force attack. Brute force password cracking is respective process of guessing password, in this process software or tool creates a large number of password combinations. Basically it’s a trail-and-error technique used by software to obtain password information from system.

A brute force attack are normally used by hackers when there is no chance of taking advantage of encrypted system weakness or by security analysis experts to test an organization’s network security .This method of password cracking is very fast for short length passwords but for long length passwords dictionary attack technique is normally used.

Time taken by brute force password cracking software to crack password is normally depend upon speed of system and internet connection.

GPU Password Cracking:

GPU is graphics processing unit, sometimes also called visual processing unit. Before talking about GPU password cracking we must have some understanding about hashes . When user enter password the password information stored in form of computer hashes using the one-way hashing algorithm.

In this password cracking technique using GPU software take a password guess and look through hashing algorithm and compare it or match it with the existing hashes till the exact match.

GPU can perform mathematical functions in parallel as GPU have hundreds of core that gives massive advantage in cracking password. GPU is much faster than CPU so that’s the reason of using GPU instead of CPU.

CUDA Password Cracking:

CUDA Compute Unified Device Architecture is a model for programming and a platform that perform computations in parallel, created by NVIDIA for graphic processing.

CUDA Password cracking includes cracking passwords using Graphics card which have GPU chip, GPU can perform mathematical functions in parallel so the speed of cracking password is faster than CPU.GPU have many 32bit chips on it that perform this operation very quickly.

We can easily access CUDA through libraries, directives and with the help of different programming languages that includes C, C++ and FORTRAN.

Password Cracking Tools

Given below is the list of Top10 Password cracking tools.

1. Cain and Abel : Top password cracking tool for Windows

Cain & Abel is one of the top cracking tool for password cracking and password recovery for Windows OS.

Cain & Abel can use techniques of Dictionary Attack, Brute-Force and Cryptanalysis attacks to crack encrypted passwords. So it only uses the weakness of system to crack password. GUI Interface of software is very simple and easy to use. But have availability limitation, tool only available for window based systems .Cain & Abel tool have many good features some of the features of tool are discussed below:

cain and abel

Features of Cain & Abel:

  • Used for WEP (Wired Equivalent Privacy) cracking
  • Have ability to record conversation over IP
  • Cab be used as Network Password Sniffer
  • Ability to resolve addresses IP to MAC.
  • Can crack verity of hashes including LM and NT hashes, IOS and PIX hashes, RADIUS hashes, RDP passwords, and lots more than that.

Site for Download:

http://www.oxid.it

2. John the Ripper : Multi-platform, Powerful, Flexible password cracking tool

John the Ripper is a free multi or cross platform password cracking software. Its called multi platform as it combines different password cracking features into one package.

It’s primarily used to crack weak UNIX passwords but also available for Linux, Mac, and Windows. We can run this software against different password encryptions including many password hashes normally found in different UNIX versions. These hashes are DES, LM hash of Windows NT/2000/XP/2003, MD5, and AFS.

john the ripper00

https://techidaily.com **Features of John the Ripper**
  • Supportive with Brute force password cracking and dictionary attacks
  • Multi platform
  • Available free for use
  • Pro version is also available with additional features

Site for Download:

http://www.openwall.com

## 3\. Aircrack : Fast and effective WEP/WPA cracking tool

Aircrack is a combination different tools used for Wifi, WEP and WPA passwords cracking. With the help of these tools you can crack WEP/WPA passwords easily and effectively

Brute force, FMS attack, and dictionary attacks techniques can be used to crack WEP/WPA passwords. Basically it collects and analyzes encrypted packets then using its different tool crack password out of the packets. Although aircrack is available for Windows but there are different issues with this software if we use this in Windows environment, so it’s best when we use it in Linux environment.

aircrack

https://techidaily.com **Features of Aircrack**
  • Supportive with both Brute force and dictionary attacks cracking techniques
  • Available for Windows and Linux
  • Available in live CD

Site for Download:

http://www.aircrack-ng.org/

https://techidaily.com ## 4\. THC Hydra : Multiple services supportive, Network authentication cracker

THC Hydra is a supper fast network password cracking tool. It uses network to crack remote systems passwords.

It can be used to crack passwords of different protocols including HTTPS, HTTP, FTP, SMTP, Cisco, CVS, SQL, SMTP etc. It will give you option that you may supply a dictionary file that contains list of possible passwords. It’s best when we use it in Linux environment.

thc hydra

Features of THC Hydra

  • Fast cracking speed
  • Available for Windows, Linux ,Solaris and OS X
  • New modules can be added easily to enhance features
  • Supportive with Brute force and dictionary attacks

Site for Download:

https://www.thc.org/thc-hydra/

https://techidaily.com ## 5\. RainbowCrack : New Innovation in Password Hash Cracker

RainbowCrack software uses rainbow tables to crack hashes, in other words we can say it uses process of a large-scale time-memory trade for effective and fast password cracking.

Large-scale-time-memory-trade-off is a process of computing all hashes and plain text using a selected hash algorithm. After calculations, obtained results are stored in the tables called rainbow table. Process of creating rainbow tables is very time consuming but when its done software works very fast.

Password cracking using rainbow table is faster than the normal brute force attack method. It’s available for Linux and Windows operating system.

rainbowcrack

https://techidaily.com **Features of Rainbow Crack**
  • Support verity of Rainbow tables
  • Runs on Windows (XP/Vista/7/8) and Linux operating systems (x86 and x86_64)
  • Simple in use

Site for Download:

http://project-rainbowcrack.com/

6. OphCrack : Tool for Windows password cracking

OphCrack used to crack Windows user passwords with the help of rainbow tables that are available in a bootable CD.

Ophcrack is completely free to download, Windows based password cracker that uses rainbow tables to crack Windows user passwords. It normally cracks LM and NTLM hashes. Software has simple GUI and can runs on different platforms.

ophcrack00

https://techidaily.com **Features of OphCrack**
  • Available for Windows but also available for Linux, Mac, Unix, and OS X
  • Uses for LM hashes of Windows and NTLM hashes of Windows vista.
  • Rainbow tables available free and easily for Windows
  • To simplify the process of cracking Live CD is available

Site for Download:

http://ophcrack.sourceforge.net/

7. Brutus : A brute force attack cracker for remote systems

Brutus is the fastest, most flexible, and most popular software used to crack remote system passwords. It guess password through applying different permutations or by using a dictionary.

It can be used for different network protocols including HTTP, FTP, IMAP, NNTP and other types such as SMB, Telnet etc. It also gives you facility of creating your own authentication type. It also includes extra options of load and resume, so process can be paused when required and you can resume process when you want.

It is only available for windows operation systems. Tool has a limitation that it has not been updated since 2000.

brutus

Features of Brutus

  • Available for Windows
  • Can be used with different network protocols
  • Tool have many good extra features
  • Support SOCK proxy for all types of authentications
  • Capability of error handling and recovery
  • Authentication engine is multi stage

Site for Download:

http://www.hoobie.net/brutus/

8. L0phtCrack : Smart tool for Windows password recovery

Just like OphCrack tool L0phtCrack is also a Windows passwords recovery tool uses hashes to crack passwords, with extra features of Brute force and dictionary attacks .

It normally gains access to these hashes from directories, network servers, or domain controllers. It is capable of doing hash extraction from 32 & 64 bit Windows systems, multiprocessor algorithms, scheduling, and can also perform decoding and monitoring networks. Yet it is still the easiest to use password auditing and recovery software available.

phtcrack

https://techidaily.com **Features of L0phtCrack**
  • Available for Windows XP, NT, 2000, Server 2003,and Server 2008
  • Can work in both 32- and 64-bit environments
  • Extra feature of schedule routine auditing on daily, weekly, monthly bases
  • After run it provide complete Audit Summary in report page

Site for Download:

www.l0phtcrack.com/

https://techidaily.com ## 9\. Pwdump : Password recovery tool for Windows

Pwdump is actually different Windows programs that are used to provide LM and NTML hashes of system user accounts.

Pwdump password cracker is capable of extracting LM, NTLM and LanMan hashes from the target in Windows, in case if Syskey is disabled, software has the ability to extract in this condition.

Software is update with extra feature of password histories display if history is available. Extracted data will be available in form that is compatible with L0phtcrack.

Recently software is updated to new version called Fgdump as Pwdump not work fine when any antivirus program is running.

pwdump

Features of Pwdump

  • Available for Windows XP, 2000
  • Powerful extra feature are available in new version of Pwdump
  • Ability to run multithreaded
  • It can perform cachedump (Crashed credentials dump) and pstgdump (Protected storage dump)

Site for Download:

http://www.darknet.org.uk/

## 10\. Medusa : Speedy network password cracking tool

Medusa is remote systems password cracking tool just like THC Hydra but its stability, and fast login ability prefer him over THC Hydra.

It is speedy brute force, parallel and modular tool. Software can perform Brute force attack against multiple users, hosts, and passwords. It supports many protocols including AFP, HTTP, CVS, IMAP, FTP, SSH, SQL, POP3, Telnet and VNC etc.

Medusa is pthread-based tool, this feature prevent unnecessarily duplicate of information. All modules available as an independent .mod file, so no modification is required to extend the list that supports services for brute forcing attack.

medusa

Features of Medusa

  • Available for Windows, SunOS, BSD, and Mac OS X
  • Capable of performing Thread based parallel testing
  • Good feature of Flexible user input
  • Due to parallel processing speed of cracking is very fast

Site for Download:

http://www.darknet.org.uk/

https://techidaily.com ## How to Unlock Vivo X100 Pro Phone without Any Data Loss

In today’s digital age, our Android phones serve as the primary hub of our lives, holding a treasure trove of personal and professional data. Yet, the frustration of being locked out due to forgotten passwords or malfunctioning security features can be overwhelming, compounded by the fear of data loss during the recovery process. However, there’s a beacon of hope - a way to unlock your Android phone without any data loss. In this comprehensive guide, we will explore the latest techniques, tools, and methods to regain access to your Android device safely without a password, PIN, or fingerprint. Let’s dive into it now.

https://techidaily.com ## Part 1. How to Unlock Vivo X100 Pro Phone with Dr.Fone - Screen Unlock (Android)

If you or someone accidentally forgot or mistyped/misentered your lock password and caused it to lock permanently, of course, you will find ways to unlock it at first. But if you are not connected to the internet, or did not register a Google account for your device, your last resort would be to factory reset your device. That will totally wipe everything you have and save it on your device. If you want to unlock your lock screen without having to worry that your device data will be erased, Dr.Fone - Screen Unlock (Android) is your phone unlocking software .

Safe download safe & secure

Note: This tool temporarily support unlocking part of Samsung and LG locked screen without losing data, but other Android phone will be wiped all data if you try to unlock the screen with Dr.Fone - Screen Unlock (Android).

Dr.Fone - Screen Unlock (Android)

Remove 4 Types of Android Screen Lock without Data Loss

  • It can remove 4 screen lock types - pattern, PIN, password & fingerprints.
  • Only remove the lock screen. No data loss at all.
  • No tech knowledge asked. Everybody can handle it.
  • Work for Samsung Galaxy S/Note/Tab series and LG G2/G3/G4.

4,464,578 people have downloaded it

Steps on How to Unlock an Android Phone with Dr.Fone - Screen Unlock (Android)

Step 1. Connect your Android phone to your PC with Dr.Fone installed, then run the program.

Step 2. Then, you should see the “Screen Unlock” tool, so proceed into it. After that,  click “Android” > “Unlock Android Screen.”

Dr.Fone home

Step 3. Then choose “Remove without Data loss” to unlock part Samsung/LG devices without data loss and find your device model.

Dr.Fone android Lock Screen Removal

Step 4. Follow the instructions on the program to get the Android phone into “Download Mode.”

  • 1. Power off the phone.
  • 2. Press and hold volume down + home button + power button at the same time.
  • 3. Press the volume up to enter download mode.

Dr.Fone android Lock Screen Removal

https://techidaily.com **Step 5.** The loading process will take you a few minutes because it is going to verify first your device's compatibility.

Dr.Fone removing lock screen

Step 6. Wait until everything is done. You should then see your device already has no lock screen.

Dr.Fone lock screen removed

That’s how to unlock an Android phone with just one click using Wondershare’s Dr.Fone. If your device is not Samsung or LG, you can use a more advanced mode to unlock your phone .

Part 2. How to Unlock Android Phone with Aroma File Manager (with Data Loss)/h2>

If you weren’t able to open your Wi-Fi or data connection or enable USB Debugging, this is the way for you to unlock your lock screen. This could be a bit complicated, but it should work.

Steps are provided below, and please follow the step-by-step guide carefully to avoid a boot loop or any other damage.

Step 1. Download Aroma File Manager on your PC. This is a tool that unlocks Android phones. Android users can use it for free.

Aroma File Manager download page

https://techidaily.com **Step 2.** Go to your Downloads folders and copy the downloaded zip file.

Copy Aroma zip file

Step 3. Plug into your PC a memory card that you can insert into your phone later. Then, go to your list of connected devices and select the memory card.

open memory card on pc

Step 4. Paste the copied Aroma zip file. Once copied, eject it from your PC, then insert it into your Android device.

Paste aroma file manager

arom file manager pasted

https://techidaily.com **Step 5.** Enter Recovery Mode for your device. Each Android device has its own ways of entering recovery mode, so take a look at this [link](http://www.digitaltrends.com/mobile/use-recovery-mode-android/) and find your device.

Enter recovery mode android

**Step 6.** When you are already in Android Recovery Mode, use your volume keys to navigate to ''apply update from external storage'', then select the zip file you copied a while ago. It will be flashed on your device.

Android system recovery

https://techidaily.com **Step 7.** After it, restart, and recovery mode will reopen as Aroma File Manager, so go to its settings and select ''Automount all devices on start'', then restart. Back in Aroma File Manager, go to the directory data>system. Check if the ff. exist. If they do, delete them. Then restart again.
  • gesture.key (pattern) / password.key (password)
  • locksettings.db
  • locksettings.db-shm
  • locksettings.db-wal
  • signature.key
  • sparepassword.key

arom file manager

Now you have your device booted up, and your Android lock screen is still locked, just gesture in or enter anything. It will be unlocked. And that's how to unlock an Android phone using your device.

Part 3. How to Unlock Android Phone Using Minimal ADB and Fastboot (with Data Loss)

If you weren’t able to connect to the Internet, but you, fortunately, enabled your USB Debugging option before your device was locked, the ARONSDB tool from the Android SDK package can help you unlock your Android phone.

Here is the step-by-step guide for you to follow

Step 1. Go to Minimal ADB and Fastboot download page.

Minimal adb and fastboot dowload page

Step 2. Download the tool’s latest version.

Minimal adb and fastboot downloaded

Step 3. Open the downloaded Minimal ADB and Fastbootzip file and install it.

Minimal adb and fastboot installer zip

Minimal adb and fastboot setup

Minimal adb and fastboot installation complete

https://techidaily.com **Step 4.** Make sure your device is connected, then go to the Minimal ADB and Fastboot installation directory.

This PC [Win 8& 10] or My computer [Windows 7 & below]> Local Disk (C:) [primary drive]> Program Files [for 32-bit] or Program Files (x86) [for 64-bit] > Minimal ADB and Fasboot.

Local Disk

Program Files (x86) folder

https://techidaily.com ![Minimal adb and fastboot folder](https://images.wondershare.com/drfone/article/2016/06/14648313625020.jpg) https://techidaily.com **Step 5.** Inside the folder, hold the Shift key on your keyboard, then right-click your mouse. An additional "Open command window here" will appear so select that.

Minimal adb and fastboot open command

https://techidaily.com **Step 6.** ADB terminal will pop out. Now, the first is to type in ADB _devices_. This is to check if your device is recognized by ADB. If there is no device listed below, try to remove and reconnect your Vivo X100 Pro and retype the command. If there are listed devices already, proceed.

Minimal adb and fastboot command window adb devices command

Step 7. Finally, type in the following commands one by one. These commands will remove your lock screen.

  • adb shell
  • cd /data/data/com.android.providers.settings/databases
  • sqlite3 settings.db
  • update system set value=0 where
  • name=’lock_pattern_autolock’;
  • update system set value=0 where
  • name=’lockscreen.lockedoutpermanently’;
  • .quit

Minimal adb and fastboot adb shell command

This would work if you have your USB debugging turned on before it was locked. That’s how to unlock Android using ADB.

Part 4: How to Unlock Phone via Find My Device (with Data Loss)

Google Find My Device is another handy way to unlock your locked Android device. However, it requires you to have your Google ID credentials and you have previously enabled Find My Device features. Moreover, it will erase all the data on your device. Use the following steps to unlock your Android phone via Find My Device:

Step 1: Open a web browser on a computer or another device and visit the Find My Device website. Now, sign in with the Google account that is linked to the locked Android device.

Step 2: After signing in, you will see a list of devices associated with your Google account on the left side of the screen. Select the locked Android device from the list and choose the “Erase Device” option from the menu on the left-hand side.

tap on erase device option

Step 3: You will now be asked to confirm your identity through a Google account password or using a pass-key. Afterward, follow the on-screen instructions to erase and unlock your Android device.

Part 5: How to Unlock Android Phone without Losing Data in Safe Mode

One way to unlock your Android phone without losing the data is by utilizing Safe Mode. This method works only if the screen lock you have been using is a third-party app. Since Safe Mode disables third-party apps, you can easily use it to uninstall the problematic app. Here is how to unlock an Android phone without losing data:

Step 1: On your Android device, press and hold “Power” and “Volume Down” keys together for 3 seconds. After the Power menu becomes visible, press and hold the “Power off” option.

Step 2: After a while, you will see the “Safe Mode” option on your screen with some basic instructions. Now, you can use the button to boot into Safe Mode and remove the screen lock application.

restart android device in safe mode

https://techidaily.com ## Part 6. How to Unlock Android Phone without Any Data Loss Using Google Account (Android 4.4 or lower)

If luckily, you left your Wi-Fi open and luckily connected to the internet, this is the easiest way to unlock your Android phone.

The step-by-step guide for you to refer

Step 1: Retry the incorrect password or pattern until the ‘’Forgotten Password/Pattern’’ appears below. Then select that.

android forgot pattern lock

https://techidaily.com **Step 2:** Check ''Enter your Google Account details'' then tap next.

Unlock screen enter google account details

https://techidaily.com **Step 3:** Input your Google Account details, username, and password. You are done.

Account unlock Google

You will be given the option to input a new password or pattern right after you enter your Google account details. But if not, Google must have emailed you your temporary password or pattern that you will input to unlock your lock screen.


  • Title: Full Guide to Unlock Your Vivo X100 Pro
  • Author: Peter
  • Created at : 2024-09-07 19:44:31
  • Updated at : 2024-09-08 19:44:31
  • Link: https://android-unlock.techidaily.com/full-guide-to-unlock-your-vivo-x100-pro-by-drfone-android/
  • License: This work is licensed under CC BY-NC-SA 4.0.