Now that you've clarified that this is not an ongoing training (originally I thought you meant install, use, uninstall, repeat), I think you might be able to get away with eval versions.
Again, it all comes down to the EULA. However, you could alway try contacting the vendor and getting authorization. As others have pointed out, the training is beneficial for them as well. Also, the fact that you want to comply with the license agreement is likely to work in your favor.