diff --git a/Source/Core/Core/IOS/ES/ES.cpp b/Source/Core/Core/IOS/ES/ES.cpp
index 6023325681..85eb87de8a 100644
--- a/Source/Core/Core/IOS/ES/ES.cpp
+++ b/Source/Core/Core/IOS/ES/ES.cpp
@@ -514,11 +514,12 @@ IPCCommandResult ES::IOCtlV(const IOCtlVRequest& request)
   case IOCTL_ES_GET_TICKET_FROM_VIEW:
     return GetTicketFromView(request);
 
+  case IOCTL_ES_SET_UP_STREAM_KEY:
+    return SetUpStreamKey(*context, request);
   case IOCTL_ES_DELETE_STREAM_KEY:
     return DeleteStreamKey(request);
 
   case IOCTL_ES_VERIFYSIGN:
-  case IOCTL_ES_UNKNOWN_3C:
   case IOCTL_ES_UNKNOWN_41:
   case IOCTL_ES_UNKNOWN_42:
     PanicAlert("IOS-ES: Unimplemented ioctlv 0x%x (%zu in vectors, %zu io vectors)",
@@ -646,6 +647,118 @@ s32 ES::DIVerify(const IOS::ES::TMDReader& tmd, const IOS::ES::TicketReader& tic
   return IPC_SUCCESS;
 }
 
+constexpr u32 FIRST_PPC_UID = 0x1000;
+
+ReturnCode ES::CheckStreamKeyPermissions(const u32 uid, const u8* ticket_view,
+                                         const IOS::ES::TMDReader& tmd) const
+{
+  const u32 title_flags = tmd.GetTitleFlags();
+  // Only allow using this function with some titles (WFS titles).
+  // The following is the exact check from IOS. Unfortunately, other than knowing that the
+  // title type is what IOS checks, we don't know much about the constants used here.
+  constexpr u32 WFS_AND_0x4_FLAG = IOS::ES::TITLE_TYPE_0x4 | IOS::ES::TITLE_TYPE_WFS_MAYBE;
+  if ((!(title_flags & IOS::ES::TITLE_TYPE_0x4) && ~(title_flags >> 5) & 1) ||
+      (title_flags & WFS_AND_0x4_FLAG) == WFS_AND_0x4_FLAG)
+  {
+    return ES_EINVAL;
+  }
+
+  // This function can only be used by specific UIDs, depending on the title type.
+  // It cannot be used at all internally, unless the request comes from the WFS process.
+  // It can only be used from the PPC for some title types.
+  // Note: PID 0x19 is used by the WFS modules.
+  if (uid < FIRST_PPC_UID && uid != PID_UNKNOWN)
+    return ES_EINVAL;
+
+  // If the title type is of this specific type, then this function is limited to WFS.
+  if (title_flags & IOS::ES::TITLE_TYPE_WFS_MAYBE && uid != PID_UNKNOWN)
+    return ES_EINVAL;
+
+  const u64 view_title_id = Common::swap64(ticket_view + offsetof(IOS::ES::TicketView, title_id));
+  if (view_title_id != tmd.GetTitleId())
+    return ES_EINVAL;
+
+  // More permission checks.
+  const u32 permitted_title_mask =
+      Common::swap32(ticket_view + offsetof(IOS::ES::TicketView, permitted_title_mask));
+  const u32 permitted_title_id =
+      Common::swap32(ticket_view + offsetof(IOS::ES::TicketView, permitted_title_id));
+  if ((uid == PID_UNKNOWN && (~permitted_title_mask & 0x13) != permitted_title_id) ||
+      !IsActiveTitlePermittedByTicket(ticket_view))
+  {
+    return ES_EACCES;
+  }
+
+  return IPC_SUCCESS;
+}
+
+ReturnCode ES::SetUpStreamKey(const u32 uid, const u8* ticket_view, const IOS::ES::TMDReader& tmd,
+                              u32* handle)
+{
+  ReturnCode ret = CheckStreamKeyPermissions(uid, ticket_view, tmd);
+  if (ret != IPC_SUCCESS)
+    return ret;
+
+  // TODO (for the future): signature checks.
+
+  // Find a signed ticket from the view.
+  const u64 ticket_id = Common::swap64(&ticket_view[offsetof(IOS::ES::TicketView, ticket_id)]);
+  const u64 title_id = Common::swap64(&ticket_view[offsetof(IOS::ES::TicketView, title_id)]);
+  const IOS::ES::TicketReader installed_ticket = DiscIO::FindSignedTicket(title_id);
+  // Unlike the other "get ticket from view" function, this returns a FS error, not ES_NO_TICKET.
+  if (!installed_ticket.IsValid())
+    return FS_ENOENT;
+  const std::vector<u8> ticket_bytes = installed_ticket.GetRawTicket(ticket_id);
+  if (ticket_bytes.empty())
+    return ES_NO_TICKET;
+
+  // Create the handle and return it.
+  std::array<u8, 16> iv{};
+  std::memcpy(iv.data(), &title_id, sizeof(title_id));
+  ret = m_ios.GetIOSC().CreateObject(handle, IOSC::ObjectType::TYPE_SECRET_KEY,
+                                     IOSC::ObjectSubType::SUBTYPE_AES128, PID_ES);
+  if (ret != IPC_SUCCESS)
+    return ret;
+
+  const u32 owner_uid = uid >= FIRST_PPC_UID ? PID_PPCBOOT : uid;
+  ret = m_ios.GetIOSC().SetOwnership(*handle, 1 << owner_uid, PID_ES);
+  if (ret != IPC_SUCCESS)
+    return ret;
+
+  const u8 index = ticket_bytes[offsetof(IOS::ES::Ticket, common_key_index)];
+  if (index > 1)
+    return ES_INVALID_TICKET;
+
+  auto common_key_handle = index == 0 ? IOSC::HANDLE_COMMON_KEY : IOSC::HANDLE_NEW_COMMON_KEY;
+  return m_ios.GetIOSC().ImportSecretKey(*handle, common_key_handle, iv.data(),
+                                         &ticket_bytes[offsetof(IOS::ES::Ticket, title_key)],
+                                         PID_ES);
+}
+
+IPCCommandResult ES::SetUpStreamKey(const Context& context, const IOCtlVRequest& request)
+{
+  if (!request.HasNumberOfValidVectors(2, 1) ||
+      request.in_vectors[0].size != sizeof(IOS::ES::TicketView) ||
+      !IOS::ES::IsValidTMDSize(request.in_vectors[1].size) ||
+      request.io_vectors[0].size != sizeof(u32))
+  {
+    return GetDefaultReply(ES_EINVAL);
+  }
+
+  std::vector<u8> tmd_bytes(request.in_vectors[1].size);
+  Memory::CopyFromEmu(tmd_bytes.data(), request.in_vectors[1].address, tmd_bytes.size());
+  const IOS::ES::TMDReader tmd{std::move(tmd_bytes)};
+
+  if (!tmd.IsValid())
+    return GetDefaultReply(ES_EINVAL);
+
+  u32 handle;
+  const ReturnCode ret =
+      SetUpStreamKey(context.uid, Memory::GetPointer(request.in_vectors[0].address), tmd, &handle);
+  Memory::Write_U32(handle, request.io_vectors[0].address);
+  return GetDefaultReply(ret);
+}
+
 IPCCommandResult ES::DeleteStreamKey(const IOCtlVRequest& request)
 {
   if (!request.HasNumberOfValidVectors(1, 0) || request.in_vectors[0].size != sizeof(u32))
@@ -654,6 +767,19 @@ IPCCommandResult ES::DeleteStreamKey(const IOCtlVRequest& request)
   const u32 handle = Memory::Read_U32(request.in_vectors[0].address);
   return GetDefaultReply(m_ios.GetIOSC().DeleteObject(handle, PID_ES));
 }
+
+bool ES::IsActiveTitlePermittedByTicket(const u8* ticket_view) const
+{
+  if (!GetTitleContext().active)
+    return false;
+
+  const u32 title_identifier = static_cast<u32>(GetTitleContext().tmd.GetTitleId());
+  const u32 permitted_title_mask =
+      Common::swap32(ticket_view + offsetof(IOS::ES::TicketView, permitted_title_mask));
+  const u32 permitted_title_id =
+      Common::swap32(ticket_view + offsetof(IOS::ES::TicketView, permitted_title_id));
+  return title_identifier && (title_identifier & ~permitted_title_mask) == permitted_title_id;
+}
 }  // namespace Device
 }  // namespace HLE
 }  // namespace IOS
diff --git a/Source/Core/Core/IOS/ES/ES.h b/Source/Core/Core/IOS/ES/ES.h
index b56ac57b69..51ad6dffa7 100644
--- a/Source/Core/Core/IOS/ES/ES.h
+++ b/Source/Core/Core/IOS/ES/ES.h
@@ -121,6 +121,9 @@ public:
   ReturnCode GetV0TicketFromView(const u8* ticket_view, u8* ticket) const;
   ReturnCode GetTicketFromView(const u8* ticket_view, u8* ticket, u32* ticket_size) const;
 
+  ReturnCode SetUpStreamKey(u32 uid, const u8* ticket_view, const IOS::ES::TMDReader& tmd,
+                            u32* handle);
+
 private:
   enum
   {
@@ -183,7 +186,7 @@ private:
     IOCTL_ES_DIGETTMDSIZE = 0x39,
     IOCTL_ES_DIGETTMD = 0x3A,
     IOCTL_ES_DIVERIFY_WITH_VIEW = 0x3B,
-    IOCTL_ES_UNKNOWN_3C = 0x3C,
+    IOCTL_ES_SET_UP_STREAM_KEY = 0x3C,
     IOCTL_ES_DELETE_STREAM_KEY = 0x3D,
     IOCTL_ES_DELETE_CONTENT = 0x3E,
     IOCTL_ES_INVALID_3F = 0x3F,
@@ -234,6 +237,7 @@ private:
   IPCCommandResult Launch(const IOCtlVRequest& request);
   IPCCommandResult LaunchBC(const IOCtlVRequest& request);
   IPCCommandResult DIVerify(const IOCtlVRequest& request);
+  IPCCommandResult SetUpStreamKey(const Context& context, const IOCtlVRequest& request);
   IPCCommandResult DeleteStreamKey(const IOCtlVRequest& request);
 
   // Title contents
@@ -283,6 +287,10 @@ private:
   bool LaunchIOS(u64 ios_title_id);
   bool LaunchPPCTitle(u64 title_id, bool skip_reload);
   static TitleContext& GetTitleContext();
+  bool IsActiveTitlePermittedByTicket(const u8* ticket_view) const;
+
+  ReturnCode CheckStreamKeyPermissions(u32 uid, const u8* ticket_view,
+                                       const IOS::ES::TMDReader& tmd) const;
 
   static const DiscIO::NANDContentLoader& AccessContentDevice(u64 title_id);
 
diff --git a/Source/Core/Core/IOS/ES/Formats.cpp b/Source/Core/Core/IOS/ES/Formats.cpp
index ba99dc77a6..66ebb0dff4 100644
--- a/Source/Core/Core/IOS/ES/Formats.cpp
+++ b/Source/Core/Core/IOS/ES/Formats.cpp
@@ -154,6 +154,11 @@ u64 TMDReader::GetTitleId() const
   return Common::swap64(m_bytes.data() + offsetof(TMDHeader, title_id));
 }
 
+u32 TMDReader::GetTitleFlags() const
+{
+  return Common::swap32(m_bytes.data() + offsetof(TMDHeader, title_flags));
+}
+
 u16 TMDReader::GetTitleVersion() const
 {
   return Common::swap16(m_bytes.data() + offsetof(TMDHeader, title_version));
diff --git a/Source/Core/Core/IOS/ES/Formats.h b/Source/Core/Core/IOS/ES/Formats.h
index 6d53baf1fc..77db4ec3b3 100644
--- a/Source/Core/Core/IOS/ES/Formats.h
+++ b/Source/Core/Core/IOS/ES/Formats.h
@@ -39,6 +39,20 @@ bool IsTitleType(u64 title_id, TitleType title_type);
 bool IsDiscTitle(u64 title_id);
 bool IsChannel(u64 title_id);
 
+enum TitleFlags : u32
+{
+  // All official titles have this flag set.
+  TITLE_TYPE_DEFAULT = 0x1,
+  // Unknown.
+  TITLE_TYPE_0x4 = 0x4,
+  // Used for DLC titles.
+  TITLE_TYPE_DATA = 0x8,
+  // Appears to be used for WFS titles.
+  TITLE_TYPE_WFS_MAYBE = 0x20,
+  // Unknown.
+  TITLE_TYPE_CT = 0x40,
+};
+
 #pragma pack(push, 4)
 struct TMDHeader
 {
@@ -51,7 +65,7 @@ struct TMDHeader
   u8 signer_crl_version;
   u64 ios_id;
   u64 title_id;
-  u32 title_type;
+  u32 title_flags;
   u16 group_id;
   u16 zero;
   u16 region;
@@ -154,6 +168,7 @@ public:
   u64 GetIOSId() const;
   DiscIO::Region GetRegion() const;
   u64 GetTitleId() const;
+  u32 GetTitleFlags() const;
   u16 GetTitleVersion() const;
   u16 GetGroupId() const;