Restricts permalink syntax and disables permalink editing after a post is published.
Strict Permalinks does two things:
post_nameportion of the permalink to alphanumerics and hyphens
Like me, you may have been under the impression that post slugs are already restricted to alphanumerics and hyphens. In the current WordPress 2.8.5, a title that includes certain kinds of punctuation (e.g., "smartquotes") will result in URL-encoded characters in the
post_name field. Many browsers handle this oddity seamlessly, however this may cause difficulties when integrating with systems expecting a more limited URL syntax.