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To protect software, you can create a validation system which requires users to provide a valid license number (Often 25 letters or digits) which they have to enter with some personal information. This then gets validated (sometimes aby using a validation server, thus requiring online access) and when valid, the user can use the registered version of an application.
Now, simple question: What kinds of solutions are there which would allow developers to implement such a licensing scheme in an easy way into their applications? I could easily create my own solution but I don't want to re-invent the wheel again...
Ezirez Intellilock has a good solution and API to implement it.
Basicly you created a function of (HW ID, Registration Key) and check if it's right.
Intellilock is just a tool to help you lock the software if the license isn't there.
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i have created a server client application using TCP in C in linux environment,and it is working very well.
I wish to improve the application by including a cryptographic algorithm into it so that the server just gets to know about who has logged in and out of the server but not about the information shared between the clients.
Any suggestions for algorithm that i should employ in my project to achieve the desired result.
I am currently looking into MD5 algorithm.
As far as I understand you want to encrypt/decrypt messages between users. If so MD5 won't do it as it is just a hash function.
https://en.wikipedia.org/wiki/MD5
Probably the best algorithm to do so would be AES:
https://en.wikipedia.org/wiki/Advanced_Encryption_Standard
There are many implementation (including in C) on the web so you can literally copy-paste the code (mind the license ;) ).
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I know that BPMN is used for Business Processes but is it possible to use it for software flows?
An example could be when a user enters a web application(www.foo.com) using his/her Google credentials(Google sign-in API). In this software flow the system compares the Google credentials(Google Database) with the web applications internal credentials(www.foo.com Database) to check if the user is an existing or a new user.
Please can you provide examples on how the BPMN is going to look like if possible.
Sure, if you choose to model that problem domain with BPMN, you can do something like that. I give you an example.
I am using here a BPMN 'collapsed pool' for the user, a 'message' for the Google API Credentials, 'service tasks' to characterize automatised software steps and a 'data store' to visualise the internal database. The read/write usage of the database can be visualised by ingoing or outcoming 'data associations' (the dotted arrows), but I recommend to use that cautiously, as data associations can quickly clutter a software oriented process model. Better focus on the process flow (the solid arrows, called BPMN 'sequence flows').
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I want to build a web application like StackOverflow, and I don't know SO use single or multiple databases.
SO has 2 main applications: Asking application and Chat application
Chat application uses SO account to login and display user's information in the chat room.
So I have some solutions:
Use 3 databases: one for common information, one for asking system and one for chatting system.
Use 2 databases: one for asking system (including common information) and one for chatting system.
Use only one database for both system.
Any body can help me? Thanks!
You have to ask yourself why you would need to use multiple databases. Why would you need to seperate data?
You seperate out databases when there is a business need: example - they cant be combined because they are both extremely large and they are completely different applications. By separating them out IMHO you are simply making more work for yourself.
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I am developing an enterprise application including central database, MVC web app, Mobile app client, web services and WPF client Windows service application which are working all together, I am going to make a contract with a company to grant them exclusive re-seller Representation .
So I am thinking a way to control the number of sales and provide them a license key for each sale to they could use the key in installation or other step and I want to get informed by the application whenever it is installing somewhere and want to prevent working when the license is used once or is expired or something. I need a solution from people who have same successful experience in this matter, indeed I have some ideas but actually I am not experienced in this issue and I'll be so happy to hear good approaches on this.
Thanks in advance ...
First you need to choose your preferred licensing system. A small list is available in the Question about OS Licensing Components. Second you'll need some kind of service where your reseller can issue licenses without real access to your private license key. E.g. some kind of webservice.
Then you'll have the number of licenses that your reseller has created and you can bill him.
If you also want to know which licenses was activated you can implement some kind of "phone home" in your application.
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How would i licence my c command line program, e.g limited functionality without a serial number?
Depends what licensing means ...
Write the license text into the source code resp. show the license text when installing or starting the program.
If you want prevent users from copying the program, things get complicated, you might need some hardware dongle.
Or just make it GPL and give the source code away ...
Include a EULA (End User License Agreement) in your program which users will have to accept while installing/using your application. You can get lots of sample EULAs in Internet. Replace the Names appropriately. But remember, you are gonna do things at your own risk. Read the EULA well, modify it to suit your needs.