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This page was created originally by nikitis with other contributors with other fixes and have been included in the correct order one should try to fix the issue.
Check [[Nikitis Downgrade Method for BluRay Playback Issue#FIX - " playback of bds is prohibited on this system. "|FIX - " playback of bds is prohibited on this system. "]] for additional details
 
There was some confusion on methods to fix and reasons why the issue occurred.  It's been 11 years since last edit, and we have a little more clarity on the issue and why it occurs, see [[Downgrade BluRay Playback Issue#Overview|Overview]] for an update on findings.
 
First, check [[Downgrade BluRay Playback Issue#FIX - " playback of bds is prohibited on this system. "|FIX - " playback of bds is prohibited on this system. "]] for easier methods to correct the issue.
 
Linux methods: If those fail, try Glevands method in Linux [[Fixing DRL and CRL Hashes]] to check for mismatches.  If it's not a mismatch then check the original but drastic method by nikitis using [[Downgrade BluRay Playback Issue#The nikitis method|The nikitis method]] for Full Factory Reset via Linux.
 
 
*Updated on 01-31-2023
*Updated on 01-31-2023
== PS3 BLU-RAY PLAYBACK PROHIBITED ROOT CAUSE ANALYSIS ==
== PS3 BLU-RAY PLAYBACK PROHIBITED ROOT CAUSE ANALYSIS ==
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Reason 1:
Reason 1:
There was a foul up with the implementation of the Sony blu-ray CSS copy protection system and some incorrect values got stored onto your blu-ray drive that was a mismatch of what your drive is aware of, so if it fails to play, it may be assuming you might have tampered with your drive.  To prevent possible hacking attempts to copy movies from the disc to a digital medium it was designed to prevent playback.
There was a foul up with the implementation of the Sony blu-ray CSS copy protection system and some incorrect values got stored onto your blu-ray drive that was a mismatch of what your drive is aware of, so it fails to play assuming you might have tampered with your drive.  To prevent possibly hacking attempts to copy movies from the disc to a digital medium it was designed to prevent playback.


Reason 2:
Reason 2:
It was intentional by Sony as a security mechanism to add your console id to CRL/DRL list when an MKB.ini file is read from a blu-ray disc.  Sony's system of updating blu-ray drives with known compromised drives/consoles is done by obtaining the console id somehow (using hacked system on PSN for example), they copy your console id and add it to the next version of the CRL/DRL.  You go to the store, and buy said movie containing updated mkb.ini file, insert it into your blu-ray drive with nice warm popcorn in hand, girlfriend (or boyfriend, we don't discriminate here) is sitting next to you ready to relax and get the error.  Movie night is ruined :(  Your console id actually matches what is on the CRL/DRL and is blocked.  What's worse is Sony will ask you to send the console in to be fixed, charge you $150, and will send you a new system instead without any of your saved games / data.  
It was intentional by Sony as a security mechanism to add your console id to CRL/DRL list when an MKB.ini file is read from a blu-ray disc.  Sony's system of updating blu-ray drives with known compromised drives/consoles is done by obtaining the console id somehow (using hacked system on PSN for example), they copy your console id and add it to the next version of the CRL/DRL.  You go to the store, and buy said movie containing updated mkb.ini file, insert it into your blu-ray drive with nice warm popcorn in hand, girlfriend (or boyfriend, we don't discriminate here) is sitting next to you ready to relaxe and get the error.  Movie night is ruined :(  Your console id actually matches what is on the CRL/DRL and is blocked.  What's worse is Sony will ask you to send the console in to be fixed, charge you $150, and will send you a new system instead without any of your saved games / data.  


Solution:
Solution:
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==== DRL Tools ====
==== DRL Tools ====
[https://web.archive.org/web/*/http://ps3devwiki.com/files/devtools/DRLtools/DRLtools_0.90.rar DRLtools_0.90.rar]
[http://www.ps3devwiki.com/files/devtools/DRLtools/DRLtools_0.90.rar DRLtools_0.90.rar]


The tools in the suite are:
The tools in the suite are:
* [https://web.archive.org/web/*/http://ps3devwiki.com/files/devtools/DRLtools/DRLtools_0.90/DRLbackup_PS3_0.90.pkg DRLbackup_PS3_0.90.pkg] (used to backup DRL1 / DRL2 files to a USB drive)
* [http://www.ps3devwiki.com/files/devtools/DRLtools/DRLtools_0.90/DRLbackup_PS3_0.90.pkg DRLbackup_PS3_0.90.pkg] (used to backup DRL1 / DRL2 files to a USB drive)
* [https://web.archive.org/web/*/http://ps3devwiki.com/files/devtools/DRLtools/DRLtools_0.90/DRLgen_WIN_setup_0.90.exe DRLgen_WIN_setup_0.90.exe] (Windows .net 2.0 application to derive DRL1 / DRL2 files from an MKB_RO.inf file)
* [http://www.ps3devwiki.com/files/devtools/DRLtools/DRLtools_0.90/DRLgen_WIN_setup_0.90.exe DRLgen_WIN_setup_0.90.exe] (Windows .net 2.0 application to derive DRL1 / DRL2 files from an MKB_RO.inf file)
* [https://web.archive.org/web/*/http://ps3devwiki.com/files/devtools/DRLtools/DRLtools_0.90/DRLcopy_PS3_0.90.pkg DRLcopy_PS3_0.90.pkg] (to restore previously backed-up DRL1 / DRL2 files or to copy derived DRL1 / DRL2 files from DRLgen)
* [http://www.ps3devwiki.com/files/devtools/DRLtools/DRLtools_0.90/DRLcopy_PS3_0.90.pkg DRLcopy_PS3_0.90.pkg] (to restore previously backed-up DRL1 / DRL2 files or to copy derived DRL1 / DRL2 files from DRLgen)


DRLGen Source: <span style="text-decoration: line-through;">[http://www.multiupload.com/QX8EDV4NTC DRLGen.rar (4.53 MB)]</span>
DRLGen Source: <span style="text-decoration: line-through;">[http://www.multiupload.com/QX8EDV4NTC DRLGen.rar (4.53 MB)]</span>
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