| View previous topic :: View next topic |
| Author |
Message |
futhamucka
Joined: 30 Jun 2006
Posts: 1
Location: California
|
 Posted: Fri Jun 30, 2006 4:05 pm Post subject: noob with q's |
 |
|
Hey
I really like your licensing system (and the price).
Can your solution do the following (and a brief overview on how to would be great...)
I need evaluation for the product that stops working after x days, I think your EvaluationMonitor takes care of that part.
Next, I need to generate a key per order (planning on using shareit for now but moving to own servers at a later date). I need this key to have an expiration date (30 days of use) so that the user is forced to purchase a new license. What is the best strategy for this other than embedding a date in the product info. If no other solution, what can be done to prohibit turning back the system time to be within the 30 day key range? How do you embed the expire date when using shareit to do all the processing?
Can I just use the registry to store the key? I don't see any reason to use a file.
I know these questions are fairly basic but a) I have no experience livcensing applications in .net and b) I don't have much time to do so.
Please help me!
Justin |
|
| Back to top |
|
 |
Infralution
Joined: 28 Feb 2005
Posts: 5027
|
| Posted: Sat Jul 01, 2006 12:28 am Post subject: |
|
|
| Quote: | | I need evaluation for the product that stops working after x days, I think your EvaluationMonitor takes care of that part. |
Yes just use the EvaluationMonitor class - see the Sample Licensed Application project for an example of how to do this.
| Quote: | | Next, I need to generate a key per order (planning on using shareit for now but moving to own servers at a later date). I need this key to have an expiration date (30 days of use) so that the user is forced to purchase a new license. What is the best strategy for this other than embedding a date in the product info. If no other solution, what can be done to prohibit turning back the system time to be within the 30 day key range? How do you embed the expire date when using shareit to do all the processing? |
You would probably have to embed a date of some kind in the product info. Otherwise what is to prevent the same key being used repeatedly to provide extensions to the time period. You could do this by recording some information about previously installed keys (eg largest serial number) on the computer somewhere - but this will be vulnerable to the user using file or registry monitoring tools to locate and reset the information. The evaluation monitor class has a mechanism for detecting clock winding - if it detects clock winding then the Invalid property of the class will be set to true. So you could simply check this. Of course like any method that relies on information stored on the users PC this is also vulnerable to tampering. In this case the user would not only have to find the information to reset but also run the computer at the wrong date which is probably disincentive enough.
| Quote: | | Can I just use the registry to store the key? I don't see any reason to use a file. |
Yes you can handle loading and storing the license key yourself (from whereever you want) and then just use the ValidateLicenseKey method to verify and read the license info. See the Custom Licensed Application sample project for an example. It stores the license key as part of an XML configuration file.
_________________
Infralution Support |
|
| Back to top |
|
|
|
FAQ
Search
Memberlist
Usergroups
Register
Profile
Log in to check your private messages
Log in
