k from nse site i found the list of legal data vendors and firstcharting is not one of them
Sr.
No.
Authorized Real Time Data Vendors/Redist
1 Bloomberg LP.
2 Factset Research Systems Inc.
3 Fidessa Plc.
4 Global Financial
5 Instinet Pacific Services Ltd
6 Interactive Data Corporation
7 Investment Technology Group Inc.
8 Newswire 18 India Pvt. Ltd.
9 Reliable Software Systems Pvt. Ltd.
10 Six Telekurs Ltd.
11 Spider Software Pvt. Ltd.
12 Thomson Reuters Ltd.
13 Tickerplant Infovending Ltd
source:
http://www.nseindia.com/content/press/List_data_Vendors.pdf