protect dll with license key

Printable View

Nov 25th, 2009, 12:59 AM
alexis23

protect dll with license key

Hi,

how can i protect my dll with a license key, i already have my licensing scheme but i dont know where to put it.

thanks,

Alexis
Nov 25th, 2009, 04:00 AM
tsungik

Re: protect dll with license key

This is what I do if i'll implement this.
Create a private function to validate the license key.

From the public functions of your DLL, call the private function to check if the user has a valid license key. Of course, provide the user a property where they can input the license key or any mechanism to enter the key.

Just my one cent.
Dec 10th, 2009, 10:10 PM
alexis23

Re: protect dll with license key

Hi,

where can i place the property for the license key, do you any sample code? please. thanks, i already have my licensing scheme, but i just don't know where to place the validation of the license key in my assemblies.

Thanks,
Dec 11th, 2009, 01:27 AM
formlesstree4

Re: protect dll with license key

He just told you where to place it. You place the validating sub/function inside the dll file, call it from the main application, and see if it is valid or not. If the key fails to pass through the dll, error out the program.
Dec 11th, 2009, 01:24 PM
kleinma

Re: protect dll with license key

when you say you have a "licensing scheme" is this some customer scheme you made, or some other protection from something like a 3rd party?
Dec 11th, 2009, 03:52 PM
Pc_Not_Mac

Re: protect dll with license key

What i do is just put all the keys to a server.
If you think about it is a safe way to protect keys and also you can blacklist keys if the user starts sharing the key.
Dec 11th, 2009, 03:59 PM
kleinma

Re: protect dll with license key

That would require an always available internet connection to validate the keys. While sometimes you can require that of your customers, many times you can not.
Dec 11th, 2009, 05:02 PM
Pc_Not_Mac

Re: protect dll with license key

This is just my way of doing it.
When you install windows they also require internet connection or by phone.
As i said before this is my way. I'm sure that you can do this with other methods like encryption.
Dec 11th, 2009, 08:51 PM
alexis23

Re: protect dll with license key

Quote:

Originally Posted by formlesstree4

He just told you where to place it. You place the validating sub/function inside the dll file, call it from the main application, and see if it is valid or not. If the key fails to pass through the dll, error out the program.

Hi,

is so sorry, if it was too complicated for me, just newbie in vs2008. just want to clear it out if i can place it in the assemblyinfo.vb or somewhere so when the assembly was loaded, it will automatically check the license, from a text file maybe.

Thanks,

alexis