"Concerning the illegitimate "Shops", can the tracks scramble the signal to stop the pirating of the signal?"
The signals are likely already srambled/crypted.
Hardly anything is broadcast on satellite dishes these days in either C or KU band that is not crypted.
Windsor Raceway was the longest hold out for encryption and recently scrambled their free C-band broadcasts.
With the encryption techniques and devices in mind?
All it takes is for somebody who has a legitimate account and password to provide the same to the pirates.
Some 25-years ago, most everything on C-band satellite dishes was broadcast in CLEAR.
HBO, ESPN and all the others.
Then the encryptions began.
In the beginning of encryptions the a new appoxiamtely 20-digit code was generated on the first of the month and used for the entire month.
The hackers/pirates would purcahse full accounts and then sell of subscriptions to their passwords. Eventually many were caught and prosecuted by the FCC.
Today the encryptions are changes many times in a single day.
The big thing today is hacked-microchips for these 18-24 inch KU band dished (Dish and Direct).
Most of the satellite hackers (like off-shore books) are located in the Carribean where those goverments have different rules than the FCC.
If you want to read about the Satellite dishes and C-Band?
Here's some non-technical stuff from a company that sells something similar to TV-Guides;http://www.orbitmagazine.com/orbfaqs.htm
This page offers a listing of the current SAT'shttp://home.austin.rr.com/drlev/schart.htm
This page offers many links that should keep your busy for eternity:http://home.austin.rr.com/drlev/info.htm