Broadband provider TalkTalk has revealed it is against a new House of Lords amendment to the digital economy bill.
Lord Clement Jones put forward amendment 102A, which would see internet service providers forced to block access to any websites that feature a large amount of copyright-infringing content.
Discussing the plan, TalkTalk's Executive Director of Strategy and Regulation Andrew Heaney said the move would not address "the fundamental concerns" of its subscribers.
He explained: "Currently we do restrict access to a few sites but only in the most serious cases, for instance those involving child pornography or issues of national security. It's hard to see how copyright infringement warrants the same draconian response."
The amendment also suggests that broadband providers have to pay costs to rightsholders unless a website is blocked before an injunction is granted, he added.
TalkTalk has regularly highlighted its opposition to aspects of the digital economy bill, including the suggestion that broadband providers should suspend the accounts of customers that illegally share files online.