The only programming needing authorization from Salem is for their long form music programming out of Nashville, such as TCM, TWIP, Solid Gospel, etc. None of the teaching programs and other content on SR1-SR6 or SNN require authorization. Any conventional U4K or 4600 should be able to receive them, once configured with the proper frequency information. If you have a network specific U4K, like from FOX, that has a network emblem on the front panel, then you may be out of luck.
You should be able to contact Derek Anderson at SRN at 972-707-6904 for assistance.