Most DVD players and Blu-ray players prohibit the viewer from performing a large majority of actions during sections of a DVD that are protected or restricted by this feature, and will display the no symbol or a message to that effect if any of these actions are attempted.
On many DVD players, pressing stop-stop-play will cause the DVD player to play the movie immediately, ignoring any UOP flags that would otherwise make advertisements, piracy warnings or trailers unskippable.
[2] Nevertheless, removing UOP does not always provide navigation function in the restricted parts of the DVD.
This has become more common in recent titles, in order to circumvent the UOP disabling that many applications or DVD players offer.
Newer DVD players (i.e. post-c. late 2010) have, however, been designed to override the aforementioned counter-countermeasures.