I got a written letter sent by post from a popular internet company saying that they are owners of respective trademarks and asked me to remove an article published in my website. I dont think its DCMA mentioned, just a complaint letter. They asked me to write within 7 days. Although i immediately removed violating material and implemented necessary changes, i am wondering what to do next? do i need to respond to them or just leave as it is? I just notified them by email. Since this is my first time i am hoping that somebody who experienced this would advice me. Thanks!
If you really need the content, get the letter / your situation reviewd by a solicitor, but if it's not important, reply and that's that.
i heard that any written communication is not valid by email. It should be sent by fax or written letter. Anyway, i sent them a fax stating that necessary changes had been done and content removed.
If it's not a DMCA or court order then you are almost surely not under any legal obligation to remove the content. It's most likely just a "cease and desist" letter trying to pressure you into removing it. Most of the time if it's not vital content and obviously not worth fighting people just remove it. However, depending on the situation removing/changing the content in response to the letter could possibly pose issues as well should they decide to press you legally.
if you are concerned send them letter via certified mail with return receipt and keep that for your records