Trying to activate my XLN producer pack and I really just couldn't read the serial number from Command Center (combination of the font and some adjacent characters).  At any rate, Command Center does not allow you to copy the s/n to the clipboard.
 
I tried as few combinations with XLN without luck, and was getting frustrated...When I remembered that the serial numbers are also on your account page at Cakewalk's website. You can copy them to the clipboard without issue then.
 
 

You could try holding down the Windows key and pressing the '+' key - this will give you a 200% view of your window and might make your serial number more readable (Windows '-' to revert to normal view).

Yup, I even pulled out the screen magnifier.  The two adjacent characters ran together and I just couldn't decipher them.  Of course, once I saw them on my product page in a different font, it was clear what the letters were.
 
My main point was more that you can easily copy them from your product page and save yourself the bother.
 
If anyone from Cakewalk wants to follow up on the illegibility, it was the last two characters of my producer pack serial number that gave me fits.

I could read them OK. It was typing them without typos that was more of a challenge.

It would be much simpler if the control centre just let you select and copy serial numbers.