Influential People - start by opening one hint at a time to see if it's enough information
Although it looks as such, the all parts of the highlighted persons are not labelled with the same dye. Some of it is sensitive to a certain thing, which can be produced with a tool in the bag.
Try using the rubber across the highlighted letters. It may take some effort. You need to warm the paper with the rubber.
When warming the the heat-sensitive dye, only four letters should remain highlighted. They are N-I-E-N. When rearragned, the letters spell N-I-N-E.
The right number and fifth digit in the code for the USB-stick is therefore 9