You might be in a scenario where you purchased multiple tickets for a show with Ticketmaster and want to split the PDF.
This is not possible as the file is encrypted. However using Ghostscript we can reprocess the file and get a new PDF that you can split as you want.
gs -q -dNOPAUSE -dBATCH -sDEVICE=pdfwrite -sOutputFile=output.pdf -dPDFSETTINGS=/prepress -f your-tickets.pdf
Note: depending on your jurisdiction this might not be legal. INAL.