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After purchasing a license you will have an email sent to you containing the license key. You can find the licensing terms here

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GpsTools Pro License

GpsTools Pro ActiveX for Windows (end user license)
 
Add GPS support to your Visual Studio application.
Unit Price:   USD 99.00 
Total:   USD 99.00
 Info plus 0% sales tax/VAT to USD 99.00: USD 0.00
USD 99.00
Delivery:   License key
Platform:   Windows 98, Windows ME, Windows 95, Windows NT, Windows 2000, Windows XP x32
GpsTools Pro ActiveX for Pocket PC (end user license)
 
Add GPS support to your Visual Studio application.
Unit Price:   USD 99.00 
Total:   USD 99.00
 Info plus 0% sales tax/VAT to USD 99.00: USD 0.00
USD 99.00
Delivery:   License key
Platform:   Win CE / Pocket PC
GpsTools Pro .NET (end user license)
 
Add GPS support to your Visual Studio application.
Unit Price:   USD 99.00 
Total:   USD 99.00
 Info plus 0% sales tax/VAT to USD 99.00: USD 0.00
USD 99.00
Delivery:   License key
GpsTools Pro .NET Compact Framework (end user license)
 
Add GPS support to your Visual Studio application.
Unit Price:   USD 99.00 
Total:   USD 99.00
 Info plus 0% sales tax/VAT to USD 99.00: USD 0.00
USD 99.00
Delivery:   License key