Seemed Like A Good Idea At The Time

[Chipchopper]

How are "tamper proof"screws removed ?

[Etch]

Do you mean the sort with a torx head?

[Buenchico]

Possibly relevant (depending upon which type of screws you're actually referring to):
https://www.wikihow.com/Remove-One-Way-Screws

See also here:

[tonyav]

Just a thought, depending on how far the heads are in whatever they have screwed together. Maybe get some mole grips on the head of the screw and twist it out that way, however if the head is flush to whatever they have screwed together then that will be difficult without damaging whatever the screw is in.

[Etch]

When faced with some tamper proof torx screws, I managed to find these driver bits (in France), and very useful they were too:
https://www.castorama.fr/embout-de-vissage-torx-inviolable-erbauer-6-pieces/3663602811275_CAFR.prd

[Buenchico]

For Torx screws . . .

[Etch]

This "security bit set" is available at Toolstation and looks pretty comprehensive:
https://www.toolstation.com/draper-security-bit-set/p52910

[Buenchico]

^^^ Also at Screwfix:
https://www.screwfix.com/p/hex-shank-mixed-security-bit-set-33-pieces/2840v