Possible features:

It has a charge up time before suppressing the security uplink upon entering normal space, not unlike the FSD cool down. I would start out with a time frame similar to resolving a ships wanted status.

It does not work at points of interest (local relay too powerful to suppress). Uncompromised navigation beacons, normal extraction sites, star ports, etc.

While displaying the uplink status of a selected target, it also doubles as a simple crime report status scanner (even if the module is disabled).

It may only be available in anarchy systems. ( it could also be a new power module - Delaine competition!? )

It may be quite an experimental, flimsy and heavy technology (high mass, low integrity compared to other countermeasures - tough choice when it comes to engineering it).

It may have a limited range (2-3 km?).

It may continuously use a tiny amount of the SYS capacitor to keep suppressing the uplink.

ECM may briefly disable it.

A malfunction of the module will restore the security uplink.

This module may be illegal. Being scanned with it by security will grant you a fine/increase your bounty.

Detailed operation:

I think a passive countermeasure utility that can cause the "no security uplink" status (in essence prevent crime reports) could be very interesting.Some assassination mission NPCs seem to already have this ability. If introduced, they would be required to equip and use this instead.It only shows up on your HUD upon entering normal space, like most other utilities.It uses an element like a scanner or ECM, with a charge bar and a status line.If you turn the module off, it will show a red "disabled" instead of the charge bar, but still display a selected targets crime report status below.If you enter a security patrolled point of interest (or lawless space - anarchy or a location where the security uplink already isn't available), it will show a red "inoperative" instead of the charge bar, but still display a selected targets crime report status below.If you enter any other point in space (such as after an interdiction), the bar will fill up and show a red "charging" below.Once fully charged, the "no security uplink" status message will show up for all ships in range (including your own). The bar will remain full and show a blue "charged" below.At 0% integrity or a dry SYS capacitor the module will not charge.An ECM discharge, dry SYS capacitor or module malfunction will reset the charge and show up a new blue "security uplink restored" message.A ship exiting the modules range will also get this message.Having a target selected will show one of these lines below the charge bar (even if the module is disabled/inoperative):"uplink active" in red - the target has crime reports on and is not currently affected by your suppressor."uplink inactive" in blue - the target has crime reports off."uplink suppressed" in blue - the target has crime reports on, but is being suppressed (module is charged and target in range - or you are at a compromised nav beacon/unauthorised installation/hazardous extraction site).You may cease fire to avoid a crime report getting through while a targets uplink is active.Note that this does not prevent you from becoming wanted for assault/murder (just the way it already is). It only prevents security response.What do you think? Interesting? Worth a utility slot? Too powerful or too many draw backs/points of failure?