"There may soon be so-called stable contents. In this case, we'd freeze the pages whose quality is undisputed," he said.
Citing a recent example of vandalism, Wales recalled how following the election of the new Pope Benedict in April, a user substituted the pontiff's photo on the Wikipedia site with that of the evil emperor from the Star Wars film series.
"The picture was only on the page for a minute. But whoever opens the article at this moment will get annoyed -- and therefore doubt our credibility," he told the paper.
Restricting access to entries particularly susceptible to unwanted attention could be one way of preventing this, he said.