Large US publishing associations have raised further objections to Amazon's and Google's requests to own a number of new top-level domain names including .book, .author and .read.
Amazon had bid to be the exclusive custodian of the .book and .author domains, and Google hopes to own the .blog domain.
However, the Authors Guild, the largest society of book authors in the US, representing more than 8,000 writers, has objected to Internet Corporation for Assigned Names and Numbers' (Icann) plans to sell such generic top-level domains (gTLD) to private companies.
"Placing such generic domains in private hands is plainly anti-competitive, allowing already dominant, well-capitalised companies to expand and entrench their market power. The potential for abuse seems limitless," said Authors Guild president Scott Turow.
"Icann, of all entities, should be mindful of the critical need to maintain an open, freely competitive Internet. Please rethink this project."
Meanwhile the Association of American Publishers (AAP) has also filed comments opposing closed gTLD applications.
In comments filed with Icann, AAP states that granting any single private company the exclusive use of a closed domain string would defeat the supposed purpose for the new gTLDs.
"From inception, the introduction of new gTLDs has been promoted as a means to increase competition, add consumer choice, support internet freedom, expand market differentiation and diversify service providers," said Allan Adler, AAP government affairs general counsel.
"How would handing over ownership of a domain string to any one single private company, such as a retailer, for its own business goals support that public service mission?"
Amazon rival Barnes and Noble is also reported by The Wall Street Journal to have objected to the ownership by the private firms.
Amazon and Google had not responded with comment at the time of publication when contacted by V3.
The objections raised by the publishers add to those raised in November against both firms, as well as Symantec, by numerous firms.
Some of the most notable submissions included brand applications such as .Oracle .Apple, .Nokia, and .Google as well as more generic submissions including .Web, .Movie, .Cloud and .Technology.
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