Hi @Siraj ,
For users accessing a server to use services such as file storage or printing, you will need User CALs.
Please also note that these are technical forums, and is not meant for providing legal advice on licensing. licensing questions are best asked directly to a trained Microsoft licensing specialist.
You can contact Microsoft directly and discuss your licensing needs - www.microsoft.com/licensing
You'll also find some licensing information here:
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Best regards,
Leon