Instant messaging stickers are often original creations of local artists who can see their little characters enjoy spectacular popularity among the country's 847 million mobile internet users and spread offline through commercial licensing deals.
The app, which like Snapchat and Instagram is centred around photos, is more focused on keeping users connected with small groups of friends,
The limit of five is in expansion of a measure WhatsApp put in place in India in July after the spread of rumors on social media led to killings and lynching attempts.
BlackBerry is claiming infringement on patents it holds for message encryption and notifications, and is seeking an injunction as well as damages for lost profits, although no figure was given.
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