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"Use Edit Log for transactions/masters, and digital signature for invoices/reports with Release 2.1. Download NOW!"
https://help.tallysolutions.com/docs/td9rel54/faq/2093.html

Surrendering the License of Tally Developer 2.7

The Activation/Surrender should be done online, i.e., your system should be connected to the internet.

To surrender the License of Tally Developer 2.7

1. Open Tally Developer 2.7 in the Server machine.

2. Go to License menu > Surrender .