What is the fine-grained topic of the following text: The DoT, in its letter issued to all the ISPs has mentioned that it had come to notice that in some cases the parent website had been blocked in contravention to what was stated in its earlier order dated 13th July 2006 whereby it ordered the ISPs to block certain websites/webpages. Only return the topic.
DoT's order to ISPs about blocking specific websites/webpages