For information on feature entitlement for versions prior to VMware NSX 4.x, please consult the following KBs:
Product offerings for VMware NSX-T Data Center 3.2.x (86095)
https://kb.vmware.com/s/article/86095
Product offerings for NSX-T 3.2 Security (87077)
https://kb.vmware.com/s/article/87077
Product offerings for VMware NSX-T Data Center 3.1.x (80866)
https://kb.vmware.com/s/article/80866
Product Offerings for VMware NSX Security 3.1.x (81231)
https://kb.vmware.com/s/article/81231
Product offerings for VMware NSX-T Data Center 3.0.0 (78223)
https://kb.vmware.com/s/article/78223
Product offerings for VMware NSX-T Data Center 2.5.x (76754)
https://kb.vmware.com/s/article/76754
Product offerings for VMware NSX-T Data Center 2.2.x (52462)
https://kb.vmware.com/s/article/52462
Product Offerings for VMware NSX-T Features in NSX Editions No Longer Offered for Sale (88846)
https://kb.vmware.com/s/article/88846
VMware Product Guide: https://www.vmware.com/content/dam/digitalmarketing/vmware/en/pdf/product/vmware-product-guide.pdf
