As seen on Slashdot:

Adobe uses a proprietary encrypted communications system between their Flash player and their Media Server product. This is intended to ensure that only people who pay for Flash Media Server can stream Flash movies, and only official clients can access them.

In other words, it’s a copy protection (DRM) scam. It’s completely antithetical to the goals of running a free software desktop or serving content to users using free software. However, despite Adobe’s claims, it doesn’t actually provide any security except through the obscurity of the protocol and some short secret keys.

lkcl claims to have created an open source, clean-room implementation of this protocol, called RTMPE, and published it on Sourceforge. Despite promising in January to open RTMP, Adobe wants to protect their revenue stream, so they sent a DMCA takedown notice to Sourceforge, who complied by censoring the project.

If you value your freedom to publish and receive Flash videos using free software, help us fight Adobe and embarrass SourceForge by nominating rtmpdump for “Best Project for Multimedia” in the SourceForge Community Choice awards.

If you just want to download it, here are some handy links now that it’s been censored by SourceForge: LKCL sehe.nl megashare.com mininova.org sumotorrent.com fulldls.com btjunkie.org mybittorrent.com demonoid.com mininova/TOR.

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Live CDs are great. In particular, they’re a great way to try out software, knowing that the chances of damaging the host system are minimal and you can throw away the entire system if you want to.

Sometimes you want to use a live CD environment without a CD. CDs are slow, get lost and scratched, and require a CD drive. If you’re going to use live environments a lot, you’d probably prefer to boot them over the network from a machine with a hard disk and a cache.

Luckily, Ubuntu’s live CD includes all the necessary support to do this easily, if you know how to use it. Unfortunately, it’s not really documented as far as I can tell. Please correct me if I’m wrong about this.

I managed to make the live CD boot over the network on a PXE client using the following steps.

  • set your DHCP server up to hand off to a TFTP server. For example, add the following lines to your subnet definition in /etc/dhcp3/dhcpd.conf:
  • next-server 10.0.156.34;
    filename "pxelinux.0";
    
  • get a copy of pxelinux.0 from the pxelinux package and put it in the tftproot of your TFTP server.
  • copy the casper directory off the CD and put it into your tftproot as well.
  • get an NFS server on your network to loopback-mount the Desktop ISO (e.g. ubuntu-8.04.2-desktop-i386.iso) and export the mount directory through NFS. Let’s say your NFS server is 1.2.3.4 and the ISO is mounted at /var/nfs/ubuntu/live. Edit /etc/exports on the server and export the mount directory to the world by adding the following line:
  • /var/nfs/ubuntu/live *(ro,all_squash,no_subtree_check)
    
  • put the following section into your tftproot/pxelinux.cfg/default file:
  • DEFAULT live-804
    LABEL live-804
      kernel casper/vmlinuz
      append file=/cdrom/preseed/ubuntu.seed boot=casper initrd=ubuntu/ubuntu-8-04/casper/initrd.gz netboot=nfs nfsroot=1.2.3.4:/var/nfs/ubuntu/live quiet splash --
    
  • test that the PXE client boots into the live CD environment
  • if it doesn’t, remove the “quiet splash” from the end of the “append” line and boot it again, to see where it gets stuck.

I hope this helps someone, and that NFS-booting a live environment will be properly documented (better than this!) one day.

(Also filed on Ubuntu bug 296089.)