Editing NPDRM

{{Wikify}}

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To merge on wiki:
* [http://www.emunewz.net/forum/showthread.php?tid=8134 PSP NPDRM explanation by Hykem]
* [http://wololo.net/talk/viewtopic.php?f=67&t=40656 How to find dev klicensee in NPDRM SELF - SPRX by '''Mysis''']

See also [https://wiki.henkaku.xyz/vita/SceNpDrm PS Vita NPDRM] and PSP NPDRM.

= PS3 NPDRM SELF - SPRX decryption steps =

Once that the user is trying to start a [[SELF - SPRX]], the [[VSH]] looks for the [[SELF_-_SPRX#Program_Identification_Header|Program Identification Header]]. If the [[Program Type]] is NPDRM, then the [[SELF_-_SPRX#Supplemental_Header_Table|Supplemental Header Table NPDRM header]] is located. From this [[NPD]] header the [[VSH]] gets the [[#DRM Type]].

If a Network DRM content is to be loaded, the [[VSH]] loads the act.dat and the .rif associated to the content (it will download .rif to VSH process memory).

For Local DRM content too, the [[VSH]] locates a file with the same CONTENT ID as in NPDRM header, then the signatures are checked (RIF offset 0x70 and act.dat offset 0x1010). Using the [[Keys#NPDRM_Keys|np_act_data_index_dec_key]], it will decrypt the actdatIndex stored in RIF.

If a Free DRM (DRM type 3) content is detected then there is no license check, so no need for .rif/act.dat, and a generic klicensee [[Keys#NPDRM_Keys|klic_ps3_free]] will be used for further steps.

Then the execution passes to [[LV2_Functions_and_Syscalls#LV2_Syscalls|LV2 Syscall no 471 sys_npdrm_regist_ekc]].
<source lang="C">
// is it titleID or content_id?
int sys_npdrm_regist_ekc(uint32_t type, char* titleID, void* klicensee, uint8_t* actdat, uint8_t* rif, int32_t licenseType, uint8_t* magicVersion);</source>
This function has different parameters depending on the [[#DRM Type]]:
* Local/Network DRM content: <source lang="C">sys_npdrm_regist_ekc(npd.type, &npd.titleID, NULL, &actdat.keyTable[rif.actDatIndex], &rif.key, npd.license, &npd);</source>
* Free DRM content: <source lang="C">sys_npdrm_regist_ekc(npd.type, &npd.titleID, klic_ps3_free, NULL, NULL, npd.license, &npd);</source>

The lv2 keeps a memory table with contentID and the associated klicensee:
* Local/Network DRM content: lv2 AES128 decrypts the encrypted klicensee from RIF by using [[Keys#NPDRM_Keys|NPDRM IDPS Seed]], [[IDPS]], act.dat and some other keys. Once transformed, klicensee is stored in a memory table.
* Free DRM content: lv2 copies the titleID and the generic klicensee (klic_ps3_free) to a memory table.

From there, the lv1 hypervisor, by loading [[Hypervisor_Reverse_Engineering#appldr|appldr]], will transform the key by using the [[Keys#ps3_klic_dec_key|ps3_klic_dec_key]] and finally remove the NPDRM layer of the SELF/SPRX to start the [[SELF - SPRX]] decryption.

= PS3 NPDRM EDAT decryption steps =

See [[EDAT files]].

= DRM Type =

A temporary name was "License type".

{| class="wikitable sortable"
|-
! Value !! Type !! Remarks
|-
| 0 || Debug || Used in SDAT files.
|-
| 1 || Network || It requires network authentication every time the content is launched. See [http://en.wikipedia.org/wiki/PlayStation_Network_outage#Inability_to_use_PlayStation_3_content inability example].
|-
| 2 || Local || It requires first time activation online (paid content but also demo and free of charge content).
|-
| 3 || Free || On PS3, it does not require any license file nor console activation (act.dat). PS3 disc bind contents use this DRM Type.
|-
| 4 || PSP || This type exists according to PS3 make_package_npdrm.exe revision 1972. However, no .rif holding this DRM Type was ever seen.
|-
| 0xD || Free (PSP2/PSM) || Used for Free contents but with license (.rif) requirement, unlike DRM Type 3. Requires either pd0:license/rifname.rif (for Welcome Park) or /app/TITLEID/sce_sys/package/temp.bin (for .pkg installed from PS Store).
|-
| 0x100 || Network (PSP2) || Seen in PS Vita OS. Forces OpenPSID comparison in RIF and thus RIF RSA signature verification.
|-
| 0x400 || GameCard (guessed name) || Requires a .rif stored in the gamecard filesystem and the cartridge to be inserted for authentication.
|-
| 0x2000 || Unknown || Seen in EP0001-NPEB00560_00-GRAW2PS3REMPKG01.rif.
|}

NPDRM contents decryption requires a key, the key licensee or klicensee. Depending on the content's DRM Type, klicensee is got in different ways:
* DRM type Network: klicensee is generated using associated RIF downloaded on-load from PS Store + ?to detail?
* DRM type Local: klicensee is generated using associated RIF downloaded on-installation from PS Store + act.dat + console's IDPS
* DRM type Free: klicensee is the constant PS3 Free klicensee (see [[Keys#NPDRM_Keys|NPDRM keys]] and [[Keys#Appldr|appldr keys]])
* DRM type Free (PSP2/PSM): klicensee is derived from associated RIF stored in the NPDRM PKG file
* DRM type GameCard: klicensee is derived from associated RIF stored in the gamecard and gamecard authentication command

Free games/applications, e.g. demos and free additional contents can either use Free, Free (PSP2/PSM) or Local DRM Types.

= License Flags =

License Flags are guessed to be either 4 or 6 bytes long (leaving DRM Type either 2 or 4 bytes long).

See [[RIF]].

* 1 by default
* 0x200 for preordered content that is not usable yet. Seen in EP1004-BLES01807_00-GTAVDLCATOMICBLI.rif, EP1004-NPEB01283_00-GTAVDIGITALDOWNL.rif and EP1004-NPEP00231_00-TGRANDTHEF000001.rif.

= Tools =

* Tools to convert RAP to klicensee: [[Dev_Tools#ReactPSN_.rap_to_.rif_converter|download links and usage]]


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