how to block someone from changing production info on IMDb Pro

Hi Richard -

In order to be as comprehensive and current as possible, we cannot
restrict updates for a specific person or title to a single source or
reject further changes.
However, for titles if you submit complete cast/crew information for
the film via the online additions system which can be found by clicking
the "Edit Page" button listed at the bottom of the title page,
and we can verify that it matches the onscreen credits we can mark the
listing as 'complete / verified'. This helps prevent future accidental additions/changes.

In the meantime, if you find that correct information is being removed from the site incorrectly, and there is a cycle of the data being added and removed and added and removed, please contact our Support team directly via our Contact Form and they can take a look: https://help.imdb.com/contact/

Note that we may require further evidence to verify the information, so please have that prepared if you need to reach out (ie. screen grab of on-screen credits, reputable media articles if the title is unreleased, etc.).