Just a consideration, but patent trolls normally approach those that are in a position to pay because it is best for them to gain an income and not just kill the cash-cow. This is now an unfortunate path in business, most tech companies will receive a claim and have to defend it and the resulting costs. You will need to talk to an IP lawyer and put forward a reasonable argument. A claim however (I am sure confirmed by a lawyer which I am not) will consider the request from a legal standpoint, is it a registered formal request or just an email that in all fairness may be ignored.
In my smaller efforts, I do a standard file search in the Windows folder/browser in detail view.. say *.mov or *.mp3 and sort them by file size and it's pretty quick.
Add the folder/view column and you can see their location and identify all the duplicates. This may not work so well for
Or is this too simple a solution?