Are the shares in my demat account safe?

What is the process to dematerialize my physical shares and is it safe to keep shares in DP account? I am worried after the Karvy case.

Can I directly apply for IPO shares in my demat account?

Can I participate in securities lending and borrowing mechanism using my shares in the demat account. How will it work?

How will I get my dividends and bonus shares in my demat account?

I was having a demat account with a broker who was banned by SEBI a few weeks ago from participating in the markets. I am now worried about my shares in my demat account.

I have some shares in my name and some in joint names with my wife and some with parents. Can I demat all these shares in a single demat account?

My sub-broker was suggesting that I leave my shares with the broker instead of transferring into my demat account. Is that fine?

What is the process of pledging my shares in my demat account if I do not want to sell it?

Are my intraday trades captured in my demat account?

Are there any specific tax implications to keep in mind when transferring shares to my relatives via the demat off-market transfer route?