Satyam Infoway Ltd v. Sifynet Solutions Pvt. Ltd. 2004 AIR SCW 3409:
Quick answer: what is this case brief about?
The Supreme Court ruled that domain names (like 'Sify') are trademarks capable of distinguishing services and are protectable through the common law remedy of passing off:
FACTS:
Satyam Infoway had multiple domain names by the name of ‘Sify’: The respondents started using the same name for their company and Satyam Infoway brought suit for injunction:
ISSUE:
Can a domain name be considered a trademark and hence have protection?:
HELD:
Yes, domain names can be considered trademark as they are capable of distinguishing the said good or service to potential users of the internet: They can be protected through passing off: Court also said that although the trademarks act 1999 does not have any provisions for protection of domain names- does not mean that domain names cannot be protected legally through passing off:
Video Summary: https://www.youtube.com/watch?v=GgJRQxPQ5-E&list=PL1DBVyVi7EaCojbQa5_XKBVJqA1y1REh&index=2

