diff --git a/rpcs3/Emu/Cell/Modules/sceNp.cpp b/rpcs3/Emu/Cell/Modules/sceNp.cpp
index 6d7298d54a..3ff4815339 100644
--- a/rpcs3/Emu/Cell/Modules/sceNp.cpp
+++ b/rpcs3/Emu/Cell/Modules/sceNp.cpp
@@ -572,6 +572,13 @@ error_code sceNpDrmVerifyUpgradeLicense2(vm::cptr<char> content_id)
 error_code sceNpDrmExecuteGamePurchase()
 {
 	sceNp.todo("sceNpDrmExecuteGamePurchase()");
+
+	// TODO:
+	// 0. Check if the game can be purchased (return GAME_ERR_NOT_XMBBUY_CONTENT otherwise)
+	// 1. Send game termination request
+	// 2. "Buy game" transaction (a.k.a. do nothing for now)
+	// 3. Reboot game with CELL_GAME_ATTRIBUTE_XMBBUY attribute set (cellGameBootCheck)
+
 	return CELL_OK;
 }
 
@@ -581,10 +588,10 @@ error_code sceNpDrmGetTimelimit(vm::cptr<char> path, vm::ptr<u64> time_remain)
 
 	if (!path || !time_remain)
 	{
-		return SCE_NP_ERROR_INVALID_ARGUMENT;
+		return SCE_NP_DRM_ERROR_INVALID_PARAM;
 	}
 
-	*time_remain = 0x7FFFFFFFFFFFFFFFULL;
+	*time_remain = SCE_NP_DRM_TIME_INFO_ENDLESS;
 
 	return CELL_OK;
 }
@@ -611,6 +618,7 @@ error_code sceNpDrmProcessExitSpawn2(ppu_thread& ppu, vm::cptr<u8> klicensee, vm
 		return error;
 	}
 
+	// TODO: check if SCE_NP_DRM_EXITSPAWN2_EXIT_WO_FINI logic is implemented
 	ppu_execute<&sys_game_process_exitspawn2>(ppu, path, argv, envp, data, data_size, prio, flags);
 	return CELL_OK;
 }
diff --git a/rpcs3/Emu/Cell/Modules/sceNp.h b/rpcs3/Emu/Cell/Modules/sceNp.h
index f1900f9c88..923ac57ede 100644
--- a/rpcs3/Emu/Cell/Modules/sceNp.h
+++ b/rpcs3/Emu/Cell/Modules/sceNp.h
@@ -244,7 +244,6 @@ enum SceNpError : u32
 	SCE_NP_COMMUNITY_SERVER_ERROR_UNSPECIFIED                         = 0x8002a4ff,
 
 	// DRM
-	SCE_NP_DRM_ERROR_LICENSE_NOT_FOUND                  = 0x80029521,
 	SCE_NP_DRM_ERROR_OUT_OF_MEMORY                      = 0x80029501,
 	SCE_NP_DRM_ERROR_INVALID_PARAM                      = 0x80029502,
 	SCE_NP_DRM_ERROR_SERVER_RESPONSE                    = 0x80029509,
@@ -260,11 +259,33 @@ enum SceNpError : u32
 	SCE_NP_DRM_ERROR_DIFFERENT_DRM_TYPE                 = 0x8002951d,
 	SCE_NP_DRM_ERROR_SERVICE_NOT_STARTED                = 0x8002951e,
 	SCE_NP_DRM_ERROR_BUSY                               = 0x80029520,
+	SCE_NP_DRM_ERROR_LICENSE_NOT_FOUND                  = 0x80029521,
 	SCE_NP_DRM_ERROR_IO                                 = 0x80029525,
 	SCE_NP_DRM_ERROR_FORMAT                             = 0x80029530,
 	SCE_NP_DRM_ERROR_FILENAME                           = 0x80029533,
 	SCE_NP_DRM_ERROR_K_LICENSEE                         = 0x80029534,
 
+	// DRM Server
+	SCE_NP_DRM_SERVER_ERROR_SERVICE_IS_END                 = 0x80029700,
+	SCE_NP_DRM_SERVER_ERROR_SERVICE_STOP_TEMPORARILY       = 0x80029701,
+	SCE_NP_DRM_SERVER_ERROR_SERVICE_IS_BUSY                = 0x80029702,
+	SCE_NP_DRM_SERVER_ERROR_INVALID_USER_CREDENTIAL        = 0x80029721,
+	SCE_NP_DRM_SERVER_ERROR_INVALID_PRODUCT_ID             = 0x80029722,
+	SCE_NP_DRM_SERVER_ERROR_ACCOUNT_IS_CLOSED              = 0x80029730,
+	SCE_NP_DRM_SERVER_ERROR_ACCOUNT_IS_SUSPENDED           = 0x80029731,
+	SCE_NP_DRM_SERVER_ERROR_ACTIVATED_CONSOLE_IS_FULL      = 0x80029750,
+	SCE_NP_DRM_SERVER_ERROR_CONSOLE_NOT_ACTIVATED          = 0x80029751,
+	SCE_NP_DRM_SERVER_ERROR_PRIMARY_CONSOLE_CANNOT_CHANGED = 0x80029752,
+	SCE_NP_DRM_SERVER_ERROR_UNKNOWN                        = 0x80029780,
+
+	// DRM Install
+	SCE_NP_DRM_INSTALL_ERROR_FORMAT      = 0x80029563,
+	SCE_NP_DRM_INSTALL_ERROR_CHECK       = 0x80029564,
+	SCE_NP_DRM_INSTALL_ERROR_UNSUPPORTED = 0x80029566,
+
+	// Game purchase processing
+	GAME_ERR_NOT_XMBBUY_CONTENT = 0x80028F81,
+
 	// Auth
 	SCE_NP_AUTH_EINVAL            = 0x8002a002,
 	SCE_NP_AUTH_ENOMEM            = 0x8002a004,
@@ -500,7 +521,9 @@ enum
 
 enum
 {
-	SCE_NP_DRM_OPEN_FLAG = 2
+	SCE_NP_DRM_OPEN_FLAG               = 2,
+	SCE_NP_DRM_EXITSPAWN2_EXIT_WO_FINI = 0x4000000000000000ULL,
+	SCE_NP_DRM_TIME_INFO_ENDLESS       = 0x7FFFFFFFFFFFFFFFULL
 };
 
 // NP Manager Utility statuses