Thank you superman, I will check it as soon as I can, which knoppix version are you using?
@joselb
The OP is running Chromium 37. Don't reckon the newer version of Chromium can utilise the NPAPI-based flash player plugin for playback any more. While using the mentioned version of Chromium to test the flash plugin from ChromeOS, I have also tried out the suggested path (/usr/lib/chromium and /usr/lib/chromium/plugins) for the Adobe branded player, and cannot get it worked as well. So far, the only way I can make Chromium pick up the Adobe player is to set the path to libflashplayer.so via the /etc/chromium/default file, but the video clip won't play as the imported plugin is NPAPI-based. I have used Chromium only on a handful of occasions, so I would have probably missed quite a few things here...
Thank you superman, I will check it as soon as I can, which knoppix version are you using?
@joselb I used the stock Chromium shipped with KNOPPIX 7.4.2 to test the Adobe flash plugin.
I will check it tomorrow in the afternoon with chromium, I can't do it sooner because I only use Firefox and Tor browser. Anyway, what I also do and mostly is to download Firefox browser (also Tor browser), extract the file/es in my /home/knoppix directory and then create a link in my Desktop. It works very well and I always use the most recent flash version, even knowing all the problems I could find using flashplayer.
I did it in chromium just now (libflashplayer.so inside /usr/lib/chromium/plugins/ ) and it works. Maybe you can't make it work because you did it differently before, I don't know.
@joselb Thanks for the confirmation. I also have no idea where I have missed since the installation process of Adobe flash player (V11.2) is merely a copy-paste action. Probably my linux skills suck more than a little bit... BTW, I wonder if your Chromium 37 could play the sample DRM-protected video clip hosted on the Adobe's website without the presence of any HAL related packages.
1.- Download 32 bits tar.gz for Linux in Adobe flashplayer website.
2.- Extract in graphic mode the tar.gz file, you will get some different files, delete all except libflashplayer.so and place it in the Desktop
3.- Open a root terminal (inside Knoppix menu). And type: cd /usr/lib/chromium/plugins
4.- Then type: mv /home/knoppix/Desktop/libflashplayer.so .
5.- Done
I went to adobe flashplayer website and I could see the clouds moving (telling me that flash was correctly installed)
@joselb Thanks for the step-by-step guide. After following your guide to install Adobe Flash Player (V11.2) on an untouched KNOPPIX 7.4.2 running in Live Mode, I still cannot get the ball rolling, nor can the plugin be recognised by the testing tool on Adobe's website. In addition, from most of the info I gathered from a few forums, Chromium 34 and upwards can only take Pepper Flash Player for playback. So I don't know how you have nailed it...
Maybe my wife is using an old knoppix, not 7.4.2. I will check chrome version too.
Yes, she is using knoppix 7.0 and chrome version is 22.0.1229.94 I will try with knoppix 7.4.2, I think I installed in some pendrive...

Dell 6P85J 4TB ST4000NM0063 7.2k 6Gb/s 3.5” SAS SED Hard Drive with Tray
$39.99
Western Digital HUS726T4TAL5204 4TB 7.2K SAS 12Gb/s 3.5" 512e HDD NetApp X375A
$64.00
Seagate BarraCuda 28TB 7.2K SATA 6Gb/s 3.5in Internal HDD ST28000DM000 - Tested
$670.00
Seagate ST12000NM0127 12TB 256MB 7200RPM 3.5" SATA 6.0Gb/s Enterprise Hard Drive
$318.99
Seagate ST4000NM0034 Enterprise 4TB 7200RPM SAS 12Gb/s HDD v4
$39.00
Seagate ST500DM009 BarraCuda 500 GB 3.5" SATA III Desktop Hard Drive
$14.99
Dell ST6000NM0034 1HT27Z-150 NWCCG 6TB SAS 3.5 7.2K ENTERPRISE SERVER DRIVE
$68.99
HGST HUS724040ALA640 HDD 4TB SATA 6Gb/s 7.5K 3.5" 0F19459 512 b/s
$78.00
DELL 2TB Enterprise HDD (7200RPM, 3.5", SATA III, 128MB Cache) HUS722T2TALA600
$49.95
(ST8000NM0045) SEAGATE ENTERPRISE 8TB 7200RPM 4Kn SATA 6Gb/s 3.5" HARD DRIVE
$199.99