using Flag of terrorist group

As per your posts you are CS and have Law Degree

One should avoid anything that is disrespectful..committing an that may be deemed to have criminal intent, to spread hatred, disturb public order, likely to strike terror, conspiracy, suspicion for recruiting for terror groups, rasinig funds for terrrost act …. etc etc

Rest speak to SHO of nearest PS and your own LOCAL counsel.

OFFENCES UNDER THE UNLAWFUL ACTIVITIES (PREVENTION) ACT, 1967; 1st schedule, 13 r/w sec3, 16 r/w sec 15

And enforcements ordered in state..

List or proscribed/banned organizations by Central/State Govt/NIA etc

Go thru website of Home Ministry

Advice all to Stay away from such Acts and everyone should spread peace and harmony.

Illegal.