Tamper-evident/tamper-resistant electronic components

A tamper-evident and/or tamper-resistant electronic module comprising an electronic component, a tamper-evident and/or tamper-resistant sheet, and encapsulant material, wherein said component is encapsulated in said encapsulant material and said sheet overlies said component, and wherein said sheet comprises a multi-layer sheet, a plurality of said layers of said sheet being selected from the groups:

• (i) an electromagnetic radiation shield layer;
• (ii) a tell-tale electrically conductive trip wire defining a convoluted meandering pathway on said layer, said trip wire meandering in a pattern which substantially covers said electronic component in a space filled area of said layer;
• (iii) a layer having the features of (ii), and in which the pathway comprises a fractal pattern;
• (iv) a layer having the features of (ii), and in which a second tell-tale trip wire extends alongside a first tell-tale trip wire so that they meander as a spaced pair,
• (v) an active electromagnetic masking emission layer adapted to emit electromagnetic radiation,
• wherein said tamper-evident and/or tamper-resistant sheet has one or more layers selected from group (ii) to (iv) sandwiched between two layers from the group (i), and
• said sheet has at least two layers in accordance with any of groups (ii) to (iv), with the meandering pathway of one layer being displaced when viewed in plan from the pathways of the other layer so that as seen in plan projection the pathways of said one and said other layers overlie, at least in part, different parts of the plan area of said component, and wherein said one layer and said other layer are sandwiched between two layers from group (i).