Diagramming tools. Visual Paradigm provides both more formal notation modeling and casual drawing capability. Diagrams under modeling categories such as UML, BPMN, etc. Comes with a data model for further manipulation i.e. Code engineering, syntax & consistency check, etc. Diagram under Casual drawing category provides 150+ types of diagrams charts and business graph which can be accessed in. Please use one the method bellow to retrieve the computer serial number: 1. Using the buid in ' wmic ' command: ' wmic bios get serialnumber '. Tip: You can use the command ' wmic csproduct get name ' to retrieve the local computer model.
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Generating and validating license keys is a common requirement for commercial desktop applications. This article shows a state of the art implementation in 2021. It is simple and cryptographically secure.
Scope
When you browse StackOverflow for licensing implementations, you frequently read the following warning:
No license scheme is 100% secure.
It is true. So, given that our task is ultimately impossible, we don't want to think about it for too long. At the same time, we want something that is reasonably safe.
This article is about registration codes that work offline. No phoning home to a license server. Even if you use a server, you likely don't want your app to stop working just because your user doesn't have internet for a brief while. To achieve this, you will need an offline way of validating licenses.
Cracks vs. keygens
There are several ways in which people can work around the copy protection in your software. The most common are cracks. These usually patch your application's executable, to trick it into believing that there is a valid license. Every desktop application can be fooled in this way. Fortunately, cracks usually only work for specific versions of an app (eg. 5.1.2 but not 5.1.3).
The worst case for software vendors are key generators. They can be used to create arbitrarily many valid serial numbers. If a keygen exists for your app, then your licensing algorithm is compromised beyond repair.
Partial key verification
To prevent keygens from working for all versions of your software, a commonly used technique is partial key verification. Under this scheme, you only use some bits to check the validity of a license key. For example, the first version of your app might only check the first character in each group of a product key:
If someone publishes a keygen for your app, then you can release a new version that checks the second character (say) for a different requirement:
This limits the potential damage of a single key generator. But it doesn't prevent other keygens from appearing for your new app version.
Key length
Historically, license keys had to be entered manually. For instance, when you bought Windows XP, you received a CD-ROM and a printed product key that you had to type in upon installation:
To make this workable, license keys had to be short and consist of simple characters such as A - Z and 0 - 9.
Nowadays, hardly anyone types in license keys by hand. When a user purchases your software, you send them an email. They either download the license key, or copy/paste it into your application. Because of this, the length of license keys has little practical relevance today.
Older articles about license verification spend a lot of brainpower on 1) encoding information in the limited-length license key, such as a maximum app version, and 2) on partial key verification. If we drop the requirement that license keys be easy to type, we can get a simpler and more secure solution.
A modern approach
At the end of the day, a license check boils down to code like the following:
Note that this even applies to more exotic solutions. For example, say your app's binary is encrypted and only valid license keys can 'decrypt' it somehow. Then license_key_is_valid() amounts to asking 'can this key be used to decrypt the binary?'.
We thus need to choose an implementation for license_key_is_valid(). Fortunately, modern cryptography gives us just the right tool for this: We can use RSA signature verification to sign the licensing data with a private key, then verify the signature with an associated public key.
Below is an example in Python that uses the rsa library. Because RSA is so ubiquitous, you should be able to easily port this to another language if required.
First, create an RSA key pair on your development machine. We use 512 bits here because it leads to shorter signatures. In practice, you probably want 2048 bits or more.
When a user purchases, generate a license key:
This prints the following:
Send this to your user. Then, in your application, check the validity of the license key as follows:
Once execution reaches the last line, you can trust that data was not tampered with. This lets you include information relevant to licensing in the data, such as a maximum app version to which your user is entitled.
The above code works as-is when you type it into one interactive Python interpreter session. In practice, you will have to ship the public key with your app and decide where the user will put the license key. These are just details however. The important parts of the implementation are all here.
Caveats & Summary
Assuming you use a large enough bit size, the above implementation should be safe from key generators. It is not immune to cracking however – as mentioned above, no desktop app is. If you want to make your app even more secure, you could look at obfuscation. This makes reverse-engineering and thus circumventing your copy protection more difficult.
Michael is the creator of fman, a cross-platform file manager. Frustrated with how difficult it was to create this desktop application, Michael open sourced fman's build system (fbs). It saves you months when creating desktop apps with Python and Qt. A few days of these months come from using fbs's well-integrated licensing implementation.
There are many backup software on the market and some of them does a really good job in making sure that there is an exact copy of the important files available at the backup drive. Although backing up of files is important, many people forget to backup the Windows product key or third party software license that is installed on their computer. When their computer crashes and had to reinstall everything from scratch, they had to go through the trouble of searching for the license number to activate the software that they've purchased. If the license key are misplaced and forgotten, they'd have to contact the software support team and provide them with proof of purchase so that they can reissue the license.
The problem is software licenses aren't stored in one standard location where you can just copy the whole folder to backup and then paste it back to reactivate all the software. They are stored all over the place either in a form of an external file or a registry key. Fortunately we found 10 software that can scan your computer and recover the lost or forgotten product key licenses so you can back it up in case you need to reactivate them again. Computer technicians can also use these software to help customers recover their software license numbers from non-bootable drive.
1. LicenseCrawler
LicenseCrawler is a portable license recovery tool that is free for private use. It scans the registry area on local and remote computers located at the same network for available serial numbers for Windows, Office and third party applications. The amount of software license that LicenseCrawler can detect is unknown because there is no such information being published at their website or program. Since it is free, you can run it and cross check if it is able to reveal the license for the shareware installed on your computer. Works on all versions of Windows including both 32-bit and 64-bit.
2. MSKeyViewer Plus
MSKeyViewer Plus is free and portable. Although the name of this tool sounded like it can only view Microsoft key, but it also support Office and third party applications as well. To view the supported applications, run the program, click the About button and followed by clicking the Supported Products button. The list of supported product seems a bit outdated because this program itself was last updated nearly 2 years ago.
3. Product Key Finder
Product Key Finder is free but take note of the adware installation when installing this program. It is a very simple program that claims to support over 200 programs but without a detailed listings. Running the program will instantly list all the license number and allows you to backup to a CSV file by clicking the Save button. Only support 32-bit Windows operating system.
4. Softkey Revealer
Softkey Revealer is free and portable program that is able to support retrieving licenses from a huge list of software which can be found on this page. Other than just depending on the signature that they created, it also seems to list keys with the value username, password, user and etc. The program is very small in size at only 200KB in size and even comes with additional tools to decrypt Adobe encrypted key, removing content advisor password and changing the current Windows key.
5. Keyfinder Thing
Keyfinder Thing is probably one of the most popular free tool to help you recover product keys from your computer. It supports a total of 90 software titles which can be viewed from the View > Software List. Syncios for mac crack torrent. You can save the results from the File menu. Take note of the installation of adware during setup.
6. Magic Keyfinder 2012
Magic Keyfinder 2012 is actually a shareware but the you can use it for free with a huge limitation where only the first 10 digits of the supported product keys are displayed. The actual amount of supported software are unknown. Other than using their database signature, you can also use the deep scan where it detects a certain keywords and determine that it is a possible license key. During testing, only 5 digits from our Windows 7 product keys are being displayed.
Download Magic Keyfinder 2012
7. Product Key Viewer
Product Key Viewer is a shareware that supports retrieving license key over 1000 applications from your computer. Only the Pro and Tech version will report activation keys for third party applications. The Lite version will only locate the Windows and Office product keys. You can test Product Key Viewer to identify what software is being identified on your computer for free except the data are being partially hidden.
Download Product Key Viewer
8. Product Key Finder by Top Password
The name of this software is exactly the same as the one listed under number 3 except this is a shareware that cost $17.95 and developed under a different company called Top Password. The amount of supported software is unknown but the official webpage did mention Windows, Office, SQL Server, Exchange Server, Visual Studio, VMWare, Adobe and many other products. The results are displayed instantly upon scanning. It supports scanning the current system, remote system or even on non-booting systems. Works on both 32-bit and 64-bit Windows.
9. Product Key Explorer
Product Key Explorer is a shareware that cost $29.50 that supports more than 4000 software and games as well. You can view the complete list of supported products at this page. You can scan both local and remote computers with the built-in option to use a different login credentials. The results can be saved to an external file or a registry file.
10. Recover Keys
Recover Keys is developed by the same company as KeyFinder Thing except that this is their shareware version that supports over 3000 software titles including games. It cost $24.95 to unlock the program or else it will only show the first 4 characters of the license number. It also comes with advanced features to scan multiple computers through IP range or manually selecting the computers that is available on the network.
Editor's Note: After testing the 10 product key recovery software above, the software that stood out in the tests are LicenseCrawler and Recover Keys. Both of this tool managed to retrieve additional licenses that weren't detected on the other 8. Although some of the software claims to support recovering license keys from more than a few thousands software, it is possible that the software installed on your computer is not in the list. You can definitely make a request by contact them to include it in their database.
You might also like:
3 Methods to Recover Windows Product Key from Dead or Unbootable WindowsRecover Lost or Forgotten CD Keys or Serials for Your PC Games3 Methods to Recover FTP Password Saved in FTP Client SoftwareAuto Enter Product Key When Installing Microsoft Office XP, 2003, 2007, 2010 and 20135 Tools to Recover Saved Windows Live Messenger Passwordjust found out keyGetter was one of the best websites for licence
ReplyBelarc Advisor – try this software ,it is absolutely free and you can easly get your system details including windows key !!!!!!!!
Reply'Editor's Note: After testing the 10 product key recovery software above, the software that stood out in the tests are LicenseCrawler and Recover Key'
I tried those two programs.
The presentation of the results is 10 times better in ‘Recover Key', so I purchased that.
(BitsDuJour is selling it at 40% off for the next 2 hours)
Dear sir, I have forgotten my software's last 5digit Serial number. How could i recover those 5 digit serial right now i have the remaining serial number. Software Name is Vakia from ICS products Salem
kindly needful your honor response, Thanking you
There are many backup software on the market and some of them does a really good job in making sure that there is an exact copy of the important files available at the backup drive. Although backing up of files is important, many people forget to backup the Windows product key or third party software license that is installed on their computer. When their computer crashes and had to reinstall everything from scratch, they had to go through the trouble of searching for the license number to activate the software that they've purchased. If the license key are misplaced and forgotten, they'd have to contact the software support team and provide them with proof of purchase so that they can reissue the license.
The problem is software licenses aren't stored in one standard location where you can just copy the whole folder to backup and then paste it back to reactivate all the software. They are stored all over the place either in a form of an external file or a registry key. Fortunately we found 10 software that can scan your computer and recover the lost or forgotten product key licenses so you can back it up in case you need to reactivate them again. Computer technicians can also use these software to help customers recover their software license numbers from non-bootable drive.
1. LicenseCrawler
LicenseCrawler is a portable license recovery tool that is free for private use. It scans the registry area on local and remote computers located at the same network for available serial numbers for Windows, Office and third party applications. The amount of software license that LicenseCrawler can detect is unknown because there is no such information being published at their website or program. Since it is free, you can run it and cross check if it is able to reveal the license for the shareware installed on your computer. Works on all versions of Windows including both 32-bit and 64-bit.
2. MSKeyViewer Plus
MSKeyViewer Plus is free and portable. Although the name of this tool sounded like it can only view Microsoft key, but it also support Office and third party applications as well. To view the supported applications, run the program, click the About button and followed by clicking the Supported Products button. The list of supported product seems a bit outdated because this program itself was last updated nearly 2 years ago.
3. Product Key Finder
Product Key Finder is free but take note of the adware installation when installing this program. It is a very simple program that claims to support over 200 programs but without a detailed listings. Running the program will instantly list all the license number and allows you to backup to a CSV file by clicking the Save button. Only support 32-bit Windows operating system.
4. Softkey Revealer
Softkey Revealer is free and portable program that is able to support retrieving licenses from a huge list of software which can be found on this page. Other than just depending on the signature that they created, it also seems to list keys with the value username, password, user and etc. The program is very small in size at only 200KB in size and even comes with additional tools to decrypt Adobe encrypted key, removing content advisor password and changing the current Windows key.
5. Keyfinder Thing
Keyfinder Thing is probably one of the most popular free tool to help you recover product keys from your computer. It supports a total of 90 software titles which can be viewed from the View > Software List. Syncios for mac crack torrent. You can save the results from the File menu. Take note of the installation of adware during setup.
6. Magic Keyfinder 2012
Magic Keyfinder 2012 is actually a shareware but the you can use it for free with a huge limitation where only the first 10 digits of the supported product keys are displayed. The actual amount of supported software are unknown. Other than using their database signature, you can also use the deep scan where it detects a certain keywords and determine that it is a possible license key. During testing, only 5 digits from our Windows 7 product keys are being displayed.
Download Magic Keyfinder 2012
7. Product Key Viewer
Product Key Viewer is a shareware that supports retrieving license key over 1000 applications from your computer. Only the Pro and Tech version will report activation keys for third party applications. The Lite version will only locate the Windows and Office product keys. You can test Product Key Viewer to identify what software is being identified on your computer for free except the data are being partially hidden.
Download Product Key Viewer
8. Product Key Finder by Top Password
The name of this software is exactly the same as the one listed under number 3 except this is a shareware that cost $17.95 and developed under a different company called Top Password. The amount of supported software is unknown but the official webpage did mention Windows, Office, SQL Server, Exchange Server, Visual Studio, VMWare, Adobe and many other products. The results are displayed instantly upon scanning. It supports scanning the current system, remote system or even on non-booting systems. Works on both 32-bit and 64-bit Windows.
9. Product Key Explorer
Product Key Explorer is a shareware that cost $29.50 that supports more than 4000 software and games as well. You can view the complete list of supported products at this page. You can scan both local and remote computers with the built-in option to use a different login credentials. The results can be saved to an external file or a registry file.
10. Recover Keys
Recover Keys is developed by the same company as KeyFinder Thing except that this is their shareware version that supports over 3000 software titles including games. It cost $24.95 to unlock the program or else it will only show the first 4 characters of the license number. It also comes with advanced features to scan multiple computers through IP range or manually selecting the computers that is available on the network.
Editor's Note: After testing the 10 product key recovery software above, the software that stood out in the tests are LicenseCrawler and Recover Keys. Both of this tool managed to retrieve additional licenses that weren't detected on the other 8. Although some of the software claims to support recovering license keys from more than a few thousands software, it is possible that the software installed on your computer is not in the list. You can definitely make a request by contact them to include it in their database.
You might also like:
3 Methods to Recover Windows Product Key from Dead or Unbootable WindowsRecover Lost or Forgotten CD Keys or Serials for Your PC Games3 Methods to Recover FTP Password Saved in FTP Client SoftwareAuto Enter Product Key When Installing Microsoft Office XP, 2003, 2007, 2010 and 20135 Tools to Recover Saved Windows Live Messenger Passwordjust found out keyGetter was one of the best websites for licence
ReplyBelarc Advisor – try this software ,it is absolutely free and you can easly get your system details including windows key !!!!!!!!
Reply'Editor's Note: After testing the 10 product key recovery software above, the software that stood out in the tests are LicenseCrawler and Recover Key'
I tried those two programs.
The presentation of the results is 10 times better in ‘Recover Key', so I purchased that.
(BitsDuJour is selling it at 40% off for the next 2 hours)
Dear sir, I have forgotten my software's last 5digit Serial number. How could i recover those 5 digit serial right now i have the remaining serial number. Software Name is Vakia from ICS products Salem
kindly needful your honor response, Thanking you
SterJo Key Finder is better and it reveals lots of keys. Also its free unlike some of those mention here.
Here is the link of the website: sterjosoft.com
thanks!!
Replythank you so much for your help. the keyfinder software really works!! =)
Replyi like this website… :)
Replythank you
Replythanks a lot
Replyman. u rock! thanks for that!! :)
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Great small app! I'll add it to my Great Software List soon.
Thanks!
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This tool is pretty handy if one needed to reformat their PCs incase of things might go wrong. Anyway, good post. Keep it up! Regards.
ReplyWhile this is a useful utility, it will be interesting to see what Microsoft's take on it is.
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